Miscanthus – carbon negative and regionally beneficial

One of the many positives of Miscanthus is its ability to be used to make Renewable Diesel Fuel (RDF), a direct and complete substitute for fossil fuel diesel. With the RDF production process being significantly carbon negative – because about 15% of the dry matter that goes in, ends up as permanently sequestered carbon. RDF from Miscanthus is based on New Zealand biomass which allows for direct import substitution, improving New Zealand’s fuel security and reducing NZ’s international fuel bill. Independent life cycle analysis has shown that growing Miscanthus is carbon negative to the farm gate point.

With Miscanthus, once it is established, all the landowner has to do is visit the farm once a year to watch it being harvested. Because of its perennial nature and annual harvest once the Miscanthus crop is established there is almost no cost and no personal time required. In addition to a cash return in the form of renewable diesel, it’s use will provide farmers with an effective pasture shelter, animal bedding, feed supplement and boiler fuel.

Miscanthus is commercially viable, carbon negative, environmentally friendly and regionally beneficial. It can also significantly reduce nitrogen leaching from farmland. The potential benefits to New Zealand agriculture, New Zealand greenhouse gas emissions, of replacing imported diesel or imported crude oil to make diesel are obvious, as are benefits in terms of reductions in net carbon dioxide emissions through the use of this very low carbon technology.

 

For more information visit: miscanthus-the-plant-articles

Multipurpose plant has big future in Germany

Researchers in Germany are looking at ways beyond meat, grain or dairying for farmers to grow and profit from in future.

On a 200-hectare farm at Meckenheim, 15km south west of Bonn, scientists are investigating how plants can be used for everything from biofuel, to building materials, paper and medicine.

The University of Bonn’s ​Dr Thorsten Kraska​ says plants such as virginia mellow, cup plant, princess tree and jerusalem artichoke can all be used for multiple purposes before being burned as biomass.

These crops can play a key role in sustainable farming in the future because they have multiple uses.

Kraska told journalists visiting the farm as part of the International Federation of Agricultural Journalists 2016 Congress the miscanthus plant excited him the most.

From the grass family, the plant had more than 30 different uses, including animal bedding, soil substitution, fuel and as a building industry material. Burning it should always be its final use.

“Don’t use your biomass plant just for energetic purposes. It should be for a material use and then later on, when you can do nothing else, then you can burn it.”

Miscanthus had a low 1:15 parts energy input to output ratio. In comparison, rape seed and maize plants had an energy input to output ratio of 1:3 and a maximum of 1:5.

It could grow more than two metres high and would overgrow nearby weeds, eliminating the need for herbicide, he said.

“It can grow up to five centimetres a day when the conditions are right. In mid-summer now, in July, we can make a measurement in the morning and in the afternoon and find clearly that the plant is growing.”

Soil fertility also increased after miscanthus was grown because it was largely a hands-off crop. No chemicals were sprayed because the plant took care of any weeds and attracted few insect pests. It needed to be harvested once a year in early summer and required about 30kg of nitrogen every second year, he says.

Miscanthus’ roots were able to fix nitrogen and those varieties that did not utilise its leaves when harvested returned about eight tonnes of organic matter to the soil when its leaves were broken down.

About five tonnes a year of CO2 was also sequestered in the soil and 30 tonnes was sequestered in the air from an average yield per hectare, he says.

Kraska estimates biomass plants could substitute about one million litres of oil currently used by farmers within a 15-kilometre radius of the research farm to remove unwanted biomass.

Miscanthus came in different varieties, with differing stem to leaf ratio and biomass potential.

Those with a higher leaf to stem ratio were less efficient for combustion because the leaves contained minerals that might corrode the inside of the oven.

But these varieties were ideal for building materials because the leaves contained a high level of silica. The stems were ideal for insulation.

“We are looking at very different varieties, and I get the feeling we are just at the beginning.”

The variety planted at the research farm is a sterile miscanthus spread by re-planting its rhizome – the stem that keeps growing, sending out roots and shoots from its nodes.

Worldwide, miscanthus yielded about 20 tonne a hectare on average, although he was aware of regions growing 40T/ha and 10-12T/ha in colder climates.

But taking it from the laboratory to the farm posed challenges in Germany, where there was no large-scale market for it. All current plantings were on a small scale, with no associated industry in support.

It was a long-term investment and commitment for a farmer with no guarantee of a committed buyer for harvesting, Kraska said.

“For miscanthus, they have to stand for three years before you get the full yield and you have to spend roughly €2000 per hectare ($NZ3000) on planting material because there are no seeds available.

“So for the first three years, they are not making money out of it. You have to grow it at least 10 years for it to be successful on an economic scale.”

This was the main reason growing large scale miscanthus crops was not popular in Germany, where miscanthus stands were on a small scale and the plant was used as fuel for domestic heating or bedding material for livestock.

All farms had areas unsuitable for cropping but suitable for miscanthus. On hillier farms, it could be used to control erosion.

“The rule for miscanthus is that if you can grow any crop, you can grow miscanthus and when you have a hilly area it might be better because it has stable roots and rhizomes and can withstand [rain and flooding] there and avoid soil erosion.”

Despite the challenges, he sees huge potential for the plant in German agriculture. “The funny thing is that it’s potential has been known for 10-20 years.”

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View full article (written September 2016) by Gerald Piddock at https://www.stuff.co.nz/business/farming/83171242/multipurpose-plant-has-big-future-in-germany-and-new-zealand

 

Miscanthus poised to take off in New Zealand

Peter Brown  of Miscanthus New Zealand Ltd (MNZ) says Lincoln University, Fonterra and local government are taking a close look at the plant’s potential.

MNZ has stands of Miscanthus growing in Huntly, Helensville, Nelson, Darfield, and Taupo.

“I believe it’s poised to suddenly take off. I think the potential is absolutely enormous. My vision for the future is that every farmer in New Zealand with land of suitable terrain would have some Miscanthus on it, even if it is just for their own use for things like calf bedding.”

It is already being used commercially in England, parts of Europe and North America, he said.

From a commercial biomass perspective, it would give farmers a steady guaranteed income stream on top of their milk, meat or crop, Brown said.

It grows well in New Zealand in most areas. It is  best to grow it on flat to rolling country because of the difficulties of harvesting on hill country.

The type used in New Zealand were sterile hybrids of Miscanthus sinensis and Miscanthus sacchariflorus. The leaves were not used for commercial purposes yet, although they could be in future as mulch, or even as low-quality stock feed, he said.

New Zealand farmers were looking at a return of at least $800-$1400 a hectare a year after three years once the plant was fully established. It is already being used for bedding for racehorses, dairy sheep. calves and dairy cows and there is growing interest in it as a domestic or commercial mulch.

It costs about $5000 per ha to establish commercial scale areas Miscanthus, but this is an upfront rather than ongoing expense. Once established, the only extra costs incurred were in harvesting, he said.

It has not been grown long enough in New Zealand to know how long a rhizome could keep producing commercially worthwhile product. In the United States there are 25-year-old Miscanthus stands still in production and Brown sees no reason why Miscanthus would not do as well in New Zealand.

That meant establishment costs were minimal if a grower was looking at it as a long-term investment. Those costs also can be reduced if larger areas are planted.

Brown understands there are discussions in Gisborne and Hawke’s Bay around using it for erosion control on hill country and for stream protection in conjunction with native trees.

Fonterra has also been looking at Miscanthus closely and MNZ has a 2ha trial plot near Darfield on Fonterra land.

There, it is being tested as a potential biomass fuel for its coal-powered milk powder dryer. Initial trials showed Miscanthus burns quickly and inefficiently but needs to first be processed into a dense high quality pellets for best use as a fuel source.

A Fonterra spokesman said its Darfield plant had the means to co-fire its boilers with coal and another form of energy. Miscanthus was an option for fuel in the future.

“We continue to look at Miscanthus as an option for co-generation, but it is one option in five or six.”

Brown said a small amount of Miscanthus had been produced as a cubed pellet and work with Fonterra is continuing. The cubes mimicked coal and contained a similar level of energy.

He estimated about 20-30ha of three-year-old miscanthus would be needed for Fonterra to use it as 10 per cent of its boiler fuel over a five-day period. It would supplement coal as a fuel source rather than replace it.

In addition to using Miscanthus successfully through their boiler, Lincoln University has also studied the plant as a source of shelter for stock on South Island farms with centre pivot irrigators.

Professor Steve Wratten of the Lincoln’s Bio-protection Research Centre says that those irrigated trials had produced 30-40 tonnes of dry matter per hectare a year.

“Roughly speaking, the production is proportionate to the rainfall. If you are irrigating it and it’s getting lots of rainfall, you can get better production.”

Like many new ideas in farming, Brown knows it will take time for Miscanthus to catch on.

“Farmers are sometimes set in their ways and it takes time for new ideas to catch on and grow. They often begin through word of mouth or with a small number of adventurous farmers giving it a try, the neighbouring farmer then sees it and copies it. Before you know it takes off and becomes the norm.”

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View full article (written September 2016) by Gerald Piddock at https://www.stuff.co.nz/business/farming/83171242/multipurpose-plant-has-big-future-in-germany-and-new-zealand

Header image: Giant miscanthus grass growing on trial at a Kirwee dairy farm could be the future of shelter belts in Canterbury.

Article updated and corrected in places in April 2019

The Miscanthus Project – November 2012 to April 2014

November 2012

Research proposal approved – decided initially to concentrate on the eco-system service benefits generated from creating Miscanthus shelterbelts.

Ground preparation started on Aylesbury Road farm and Karetu farm. 48 bumble bee motels placed.

December 2012

Planting of Miscanthus in the first four paddocks took place.

January 2013

Three dairy farms planted with Miscanthus – a total of 10 paddocks being used to firstly investigate the growth potential of the plant itself and also to monitor its effectiveness in providing ecosystem services to dairy farms.

February 2013

Monitoring of soil moisture levels, water input and pasture production underway. Monitoring of bumble bee motels placed in six paddocks has revealed that out of 48 motels placed with 4 compartments in each motel only one compartment showed any sign of occupancy.

March 2013

We move from having 34 plants that we imported in tissue culture, to supplying several hundred thousand plants to landowners keen to grow Miscanthus. We are now looking for new sites in Northland where there is rapidly firming demand for Miscanthus biomass product, sufficient for us to need to get 7000 or more hectares planted.

At Aylesbury farm, where Miscanthus plants suffered initially when irrigation was not available, the plants are now thriving and are over a metre tall.

April 2013

The earliest plantings in Hawke’s Bay – now two years and two months from the day they were planted – are thriving in spite of the very dry summer that they have had. We now have data running from November through to the end of March on the feed value of Miscanthus from one site.

Growth of irrigated plants has continued to be impressive at Aylesbury farm with some now over 1.5 m tall. Karetu farm received its first significant rainfall since February 6 on March 19 with 26 – 30 mm of rain over two days. This resulted in what were apparently dead Miscanthus plants sprouting new shoots, indicating the robustness of this plant.

May 2013

We finally saw the end of the drought. As expected, although the Miscanthus is deep-rooted, if there is no rain, eventually the dryness gets down as far as the Miscanthus roots extend. Indications are that where establishment and particularly initial weed control was effective, the plants performed extremely well until around the end of January when they began to show drought effects.

June 2013

Interest in Miscanthus is growing rapidly and Miscanthus New Zealand (MNZ) has had a number of enquiries from people wanting to order small quantities to establish tiny trial areas of Miscanthus on their properties. We put together a Miscanthus plant cost schedule that progressively increases the cost per plant for smaller numbers.

MNZ has also been approached by the developer of a hybrid biomass processing facility that is to be based in Northland and that will require large quantities of Miscanthus feedstock material.

July 2013

Miscanthus planted in the irrigated paddocks of Aylesbury Farm achieved a maximum height of 1.5m which is impressive considering the late planting and initial lack of irrigation. This growth was achieved from initially water-stressed plants in just four months. Expected height from growth over seven months was 1m.

September 2013

In the past month or two, a lot of our focus has been on what is effectively a side business, which is the establishment of renewable diesel plants in New Zealand. Miscanthus New Zealand Limited was approached some time back by an American company called REEP Development LLC, which is half owned by a Kiwi, to see if we would be interested in use of Miscanthus through their proprietary process to make renewable diesel.

The first signs of re-growth started to appear at the beginning of September.

October 2013

The growing season for Miscanthus is well underway and even in areas that have not been harvested the Miscanthus is shooting up extremely quickly. Reports from Canterbury have indicated that while the Miscanthus started growing quite early, it does tend to get stopped by cold spells and then starts to grow again after the cold spell has finished.

December 2013

MNZ purchased the assets of the only other New Zealand importer of Miscanthus plants, making it the sole supplier of Miscanthus plants in New Zealand. So MNZ is now the owner of almost ten hectares of Miscanthus at three locations from North of Auckland to Canterbury. Also, significant harvested product in baled form now owned by MNZ and available for research and sale.

January 2014

Bumble bee motels were restocked over the winter. Previous research shows occupancy improves in season two and three after placement. Last season, no motels were used as nesting sites and this season only two out of 48 motels were occupied.

The Miscanthus that MNZ customers have established over the last few years almost all continue to thrive. The original Hawkes Bay planting was well over 2 metres by early December and the reasonably regular wet weather this season has helped in the development of the Miscanthus.

Use of the Miscanthus harvested product for fuel, renewable diesel, stock bedding, emergency stock feed, garden mulch and other more technological uses is all being actively pursued by MNZ staff and associates.

February 2014

In conjunction with Lincoln University, Miscanthus New Zealand Limited has been asked by a major New Zealand company to put in a proposal to look at undertaking some significant research into production and use of Miscanthus in an industrial setting.

April 2014

Expected maximum height at the end of season is 2-3m, despite early setbacks from no irrigation during the spring drought these Miscanthus plants demonstrated impressive growth rates.

A group from DairyNZ visited Aylesbury Farm to find out how Miscanthus can benefit dairy farms and become an integrated component of the farming system. A journal article on the ecosystem services and ecosytem dis-services provided by Miscanthus as a shelterbelt on dairy farms is being prepared with a view to submission late winter.

 

Tall grass proves its versatility

A tall grass touted as a multi-purpose wonder plant has proved its worth as a shelterbelt replacement for Canterbury dairy farms, says Lincoln University ecology professor Steve Wratten.

A North Asian grass closely related to sugarcane, Miscanthus x giganteus grows to 3.5 – 4m high and is used overseas for feedstock for biofuels, stock bedding and emergency stock feed.

Research by Lincoln University PhD student Chris Littlejohn, supervised by Wratten and originally funded by Westland Milk Products, looked into the performance of six L-shaped trial plots of Miscanthus grown on a dairy farm at Aylesbury, about 30km west of Christchurch.

On dairy farms where traditional shelter belts have been removed to make way for pivot irrigation, Wratten says Miscanthus can act as windbreaks and be harvested for supplementary income.

Wratten said they identified 15 specific benefits such as shelter for animals and increasing biodiversity as habitat for the likes of skinks and bumblebees.

Not only do cows appreciate the shelter, the research confirmed that pasture itself does better in the lee of the miscanthus. In windy conditions the stomata of green plants – the tiny ventilation holes in the outer skin – close up and throttle the plant’s metabolism, but the shelter provided by Miscanthus mitigates that effect.

Separate plantings of Miscanthus along about a kilometre of the farm’s road boundary are now testing the ability of a soil fungus known as Trichoderma to help plant growth.

In a randomised trial in which different sections of the plot got different blends of the fungus, or none at all, some sections are already showing good results in what Wratten says was poor stony soil previously full of broom and eucalypts.

With Miscanthus capable of yields of up to 40t DM/ha, Wratten is now seeking funding for trials on converting the harvested grass into renewable diesel.

While the diversion of productive land for biofuel production could be controversial, Wratten emphasised that as a by-product of its other uses, Miscanthus renewable diesel would be a truly renewable resource that need not compete with food production.

The only New Zealand supplier of the plant is Miscanthus New Zealand Ltd, whose managing director Peter Brown said it had been “a long slow process” getting Miscanthus accepted since he began propagating it from plants imported in 2010. “But people are starting to get serious about it.”

Miscanthus is a long-lasting perennial, the tops browning off in autumn and the grass renewing itself in spring from underground rhizomes. As a sterile hybrid, it can only be propagated vegetatively so seed-borne spread is impossible and it is considered very unlikely ever to become a pest.

Because it is palatable to stock, grazing would take care of any rhizome spread beyond the fenced plantings on dairy farms. Brown says there has never been a recorded spread beyond planted areas anywhere in the world.

Fonterra has a 2ha trial plot of Miscanthus at its Darfield plant, where it has had a dramatic effect on reducing nitrogen leaching from the factory effluent sprayed onto the pasture.

Lysimeters below the Miscanthus recorded nitrogen levels dropping away as soon as the grass was properly established, Brown said. “It is less than 0.1kg/ha. It’s a dramatic change.”

Brown said Fonterra had previously investigated dried Miscanthus as a fuel for its milk drying plants but it proved too light and fluffy for compatibility with its coal-fired furnaces.

However, Brown said his company now had samples of cubed miscanthus, machine-pressed into lumps of about the same density and size as coal.

The machinery to produce significant quantities of the cubed material was not yet available, but Brown hoped that Fonterra would eventually conduct a full trial. Although that’s not likely to be this year, Brown believed it would be successful and could lead to Fonterra planting miscanthus on a commercial scale at its Darfield and Clandeboye site­s.

The country’s total planted area of Miscanthus might then at least double from its current estimated 45ha, Brown said.

Tony Oosten, programme manager, energy and utilities group at Fonterra, confirmed that Fonterra was looking into Miscanthus as a fuel but large-scale plantings were only a possibility at this stage.

He said that a trial of the cubed miscanthus material would have to consider not just how well it was handled by the feed systems but also its burning characteristics, including whether it produced corrosive ash or undue amounts of hard deposits known as clinker, in the furnaces.

Meanwhile, Brown said another use for Miscanthus well-suited to the current quantities planted in NZ was as bedding for livestock including horses and goats. A poultry farmer was currently keen on a trial.

“I know that’s going to go well because that’s what a lot of our colleagues overseas are using it for.”

Brown says Miscanthus was also useful as mulch, and a trial on a Kerikeri feijoa orchard was showing promise in combating the guava moth pest.

 

Written by  Nigel Malthus – Rural News (09/03/17) – with minor corrections

 

Updated comments from Miscanthus New Zealand Ltd August 2018:

In the Lincoln shelter trials in Canterbury, pasture growth in the sheltered area increased by 14% meaning that this growth increase more than made up for the area taken up by the Miscanthus shelter strips.

It seems very likely that Fonterra will be planting at least 10 ha and perhaps 30 ha of Miscanthus this season. Two other dairy companies are also already committed to being directly financially involved.

Other farmers are looking to plant at least 20 ha of Miscanthus this season, most of them for their own use as bedding or mulch.

The bedding uses have now expanded to include dairy sheep – a use that has suddenly become the major customer for existing Miscanthus supplies. The dairy sheep farmers are also planting significant areas of Miscanthus to provide in time, their own future supply.

A recent interesting development has been use of Miscanthus in dairy cow composting barns, where it performs extremely well – perhaps better than the traditional sawdust that has been used in these plants until now. Miscanthus New Zealand thinks that this sort of cow and farm management system is likely to be the way of the future for sustainable and environmentally friendly dairying in New Zealand where animal welfare is also a prime consideration.  And unlike sawdust, with Miscanthus, the farmer can grow his own bedding supplies really easily.

Miscanthus Overview and its use as a Wind Break and Biofuel

Miscanthus is a high yielding crop that annually grows over three metres tall. Similar in appearance to sugar cane, it produces a crop every year without the need for replanting. Miscanthus is used for feedstock production for energy and non-energy end uses. It is a valuable crop, offering major benefits to many sectors, inside and outside of agriculture. It can also be used as animal bedding material and can act as an emergency feed supply during droughts.

Miscanthus grass forms a thick barrier which acts as an excellent wind break and shelter for animals and pasture. Rich green summer foliage is topped by beautiful arching sprays of silky russet pink or white flowers. In winter the foliage takes on a russet gold colour, producing a thick bushy screen that, unlike other forms of screening, does not require pruning or any trimming.

Harvested Miscanthus material can be used to generate heat and power and may be used as a feedstock for advanced biofuels, outperforming maize and other alternatives. The outlook for bioenergy looks positive. It is expected that significant volumes of biomass will be required; some of which will come from energy crops.

The Miscanthus growth pattern is repeated every year for the lifetime of the crop, and the harvest gives an annual income to the farmer. In the first year of growth stems reach up to 1-2 metres in height. Harvesting takes place from the second year, during which the crop can be expected to reach a height of 2.5–3 metres.  In subsequent years, it can reach a height of 3-4 metres. The crop has a useful life of at least 25 years. Miscanthus is not invasive like pampas or bamboo. It is a sterile hybrid, so it cannot reproduce itself by seed.

Miscanthus is a perennial C4 rhizomatous grass originating from Asia. It will grow on a wide range of soil types, but higher yields are achieved on free-draining moisture retentive soils. From the end of year two, leaf litter and canopy closure will give effective suppression of most weeds. Harvesting is carried out during late Winter or Spring. The crop is generally harvested using a mower conditioner or forage harvester.  It is generally dry when harvested but if necessary, it can be allowed to dry in the field before baling.

The benefits of Miscanthus are that it is high yielding, environmentally friendly, easy to grow and is low maintenance. It is suitable for coastal areas and performs well in windy positions.

Project Update April 2014

Biofuel feedstocks as co-products on dairy farms: income and sustainability benefits

Project Update. Period: January to April 2014

Chris Littlejohn, Bio-Protection Research Centre, P O Box 85084, Lincoln University. p: +64 3 325 3838 extension: 8639 Mob. +64 2108204285
Funders: Westland Milk Products Ltd. and DairyNZ, + support from AgResearch and Lincoln University

Open/Download the PDF

Season Two

Miscanthus (Mxg) growth

Second-season Mxg shelterbelts

Under renewed irrigation, following repair in November of the centre pivot damaged in the September gales, growth rate of established Mxg shelter has remained impressive with paddocks 21 (Fig.1) and 6 reaching an average height of 2.0 m and 1.8 m, respectively, by mid-February. Maximum height for both shelterbelts was 2.3 m. Expected maximum height at the end of season 2 is 3 m so despite early setbacks from no irrigation during the spring drought these Mxg plants demonstrated impressive growth rates.

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Fig.1: Miscanthus x giganteus (Mxg) shelterbelt; Paddock 21, Aylesbury Farm, Feb 17, 2014.

Mxg shelter in paddock 22 has also continued to show good recovery from the severe early season setbacks of drought and vehicle damage during pivot repair. Despite no visible growth until mid-November average height is now 1 m without any loss of plants. It will be interesting to see how this year’s reduced growth affects next season’s performance.

New planted Mxg shelterbelts

The average height after 3 months growth for the new plantings this season is 35 cm for paddock 12 and 24 cm for paddocks K2 and K3. Average height for all paddocks at this stage last season was 50 cm. K2 and K3 are both irrigated with a rota-rainer and have had reduced irrigation compared to the centre pivot used elsewhere on the farm. This shows the necessity of adequate irrigation for attaining high yields in Canterbury. The rota-rainer delivers 36 mm each pass but was irrigating paddocks only every 8 days. On dry windy days evapotranspiration rates would be higher than the average daily amount of water applied and the soils would be in a state of negative water balance. This was reflected in soil moisture readings which were as low as 12% by volume 0v on some occasions. This also illustrates the benefit of sheltering pasture from the effects of drying winds. The centre pivot at Aylesbury farm delivers a higher application rate of water and soil moisture levels of paddocks irrigated with the centre pivot never drop below 25% by volume.

The new plantings in paddock 12, although not yet under the centre pivot due to delay in replacing the end boom, have had adequate irrigation due to K-lines being installed and were one third taller than those in K2 and K3. Mxg plantings last season also performed better than these plants and this may be a reflection of higher sunshine and temperatures. Good establishment is important as research indicates that poor first season growth can delay attainment of maximum yield potential; however by season 5 planting density and initial growth are no longer limiting factors (Danalatos et al 2007).

Shelter effects on pasture growth

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Fig.2: Differences in grass growth between (a) unirrigated and (b) irrigated areas, Aylesbury Farm, Dec 30, 2013.

After repair of the centre pivot pastures recovered quickly from drought (Fig.2) and shelter benefits on pasture growth started to become apparent. C-Dax readings taken at the end of February showed an increase in yield of 12% in the area of paddock 21 sheltered by the Mxg plants and in paddock 6 the yield increase was 10%. One possible driver for this is that leaves of pasture plants sheltered from the wind keep their stomata open longer, shown by a higher rate of stomatal conductance, due to reduced effects of water stress. As a result, they photosynthesise longer, resulting in more growth.

Stomatal conductance measurements were taken using a porometer (Fig.3) during late spring and summer and the results show that during drying northerly winds there is a higher level of conductance in sheltered clover plants. Clover leaves were chosen as they fit the measuring chamber better than ryegrass leaves. Fig. 4 shows average readings taken between 11.30 h and 15.30 h in paddock 21 on 23 January 2014. A strong north-westerly wind was blowing and the average temperature was 19 0C.

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Fig.3: Decagon porometer used for measuring stomatal conductance.

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Fig.4: Differences in stomatal conductance between sheltered and open-paddock area. Paddock 21, Aylesbury Farm on 23rd January 2014.

Improved pasture yield

Using data collected from C-Dax pasture readings AgResearch produce maps illustrating the heights of pasture across the paddock. Fig.5 was produced from C-Dax readings taken from paddock 21 on 14 February 2014. Dots on the map indicate where readings from the C-Dax have been taken. The shelter area and control area are 40 m by 40 m in size and this is where concentrated C-Dax readings are taken. These areas have also been used to collect soil samples, pasture quality samples and record dung pat numbers post grazing. Comparing these two areas gives a direct comparison of pasture production with and without shelter. The remainder of the paddock is measured by passes of the C-Dax approximately 10 m apart and this provides a record of pasture growth over the whole paddock. Fig.5 shows that pasture height is highest near to the Mxg shelterbelt and also a possible shelter effect can be seen in the form of higher grass growth extending out from the shelter area.

lincoln-research-project21

Reduced evapotranspiration rates

Mobile data logging equipment has been built by Lincoln University technician Stephen Stillwell and this is being tested in the University nursery (Fig. 6) before being placed on farm. By using the meteorological data this collects and interpreting these data using the Penman equation for calculating evapotranspiration rates comparisons between sheltered areas and open paddock can be performed.

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Fig. 6: Mobile data logging equipment for measuring evapotranspiration rates.

Cattle and shelter

One of the unanswered questions surrounding the provision of shelter for cattle is do they actually use it? Events at the beginning of March, when there was wet weather and a severe southerly winds blowing for three days, go some way to resolve this. When placed in paddock 21 for the night, most of the cows congregated at the northern end of the paddock as they turned their backs to the wind and walked until they found shelter or could not go any further.

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The consequences, as illustrated in Fig.7, were severe pugging of the paddock and as the cows broke into the Mxg shelter, they stripped the leaves from the plants. The advantage of having Mxg as a shelterbelt in this case is that it will regrow and these plants have already started to produce leaves. Also, despite the 300 to 400 cows trampling through it, most of the stems remained upright. More importantly is the loss of production from the pugged pasture which could be as much as 30% over a season.

The fact that the cows behaved in exactly the same way the next day in a paddock with no shelterbelt shows they do walk away from the prevailing wind. However if the Mxg had been planted all around the paddock, and was at its full height of 4 m, the cows may have been sheltered enough from the southerly wind to not walk to the northern end of the paddock. When the springers (cows due to calve) were put into paddock 21 the next day, they did turn their backs to the wind but also made use of the limited shelter (due to early-season damage) afforded by the Mxg shelter in paddock 22 (Fig.8).

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Fig.8: Cows sheltering from a southerly wind in paddock 21, Aylesbury Farm, 2 March, 2014.

Presentations and media promotion

On January 27 a group from DairyNZ, hosted by Ina Pinxterhuis, PhD, Senior Scientist, South Island, visited Aylesbury Farm to find out how Mxg can benefit dairy farms and become an integrated component of the farming system. This was organised as part of DairyNZ’s funding agreement which involves passing on information about this research to the wider dairy industry.

In February I gave a talk on our research at the 2nd National Conference on Biological Farming Systems at Rotorua, 20 – 21 February 2014.This was well received and generated considerable interest, the furthest of which was from a delegate based in Malaysia. Since then we have Mxg enquiries from Iran.

On 13 March TV3 News filmed Prof. Steve Wratten and I (Fig.9) at Aylesbury Farm for a news item on our Mxg research. This was screened on March 17 and can be viewed at http://www.3news.co.nz/Bio-energy-grass-could-fuel-farms/tabid/423/articleID/336394/Default.aspx.

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Fig.9: Chris Littlejohn and Steve Wratten being filmed for TV3 News, 13 March 2014.

As a follow-up to this news coverage and as a ‘teaser’ for the Open Day which will be held at Aylesbury Farm on 14 May, Steve Attwood,(Convergence) representative for Westland Milk Products Ltd., is organising a press release to further promote this research. The Open Day will be primarily aimed at invited representatives from the dairy industry and associated interested organisations including banks. Another more farmer oriented Open Day will be held next season.

Journal submissions

A journal article on the ecosystem services (ES) and ecosytem dis-services (EDS) provided by Mxg as a shelterbelt on dairy farms is being prepared with a view to submission late winter. This will analyse a number of ES (e.g., improved pasture production, reduced irrigation need, improved pollination rates) and EDS, (e.g., flammability, pugging), and an attempt will be made to provide a monetary value for these. Helping with this will be Katie Bicknell, Senior Lecturer in Economics at Lincoln University, and it is great that Katie has offered her expertise for this.

Thanks

I wish to acknowledge those who have given their support to this project, in particular the funding from Westland Milk Products Ltd and DairyNZ, and the welcome assistance and equipment from AgResearch. From all the media attention the work is receiving it is clear that this work is novel and of high potential.

Regards
Chris

References
Danalatos NG, Archontoulis SV, Mitsios I (2007) Potential growth and biomass productivity of Miscanthus×giganteus as affected by plant density and N-fertilization in central Greece. Biomass and Bioenergy 31, 145-152.

Blog Post – February 2014

Things were very hectic through January and into February. I do not think I really realised at the time we purchased the Taharoa C Block Incorporation Miscanthus assets, just how much work this would involve. Whereas we had previously been focusing on the production of plantlets with the aim of getting into rhizomes eventually, plus a multitude of end uses for the product once it was grown, we now suddenly you are in a position where we had become a Miscanthus grower with over 9 ha well into production. In addition, we now owned a moderately substantial tonnage of harvested and baled Miscanthus for which we had to find a profitable home.

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Miscanthus New Zealand Ltd Miscanthus stand in February 2014

At the time of purchasing these assets, I had based the pricing (mostly) on known returns so the challenge of course was to see whether these prices could be improved upon. We discovered that there were stumbling blocks, mostly put up by the former advisors to Taharoa – stumbling blocks that did not seem to us to have any positive purpose for anyone whatsoever and seemed to be based on a more “dog in the manger” attitude.

However I have been lucky to have very able assistance from a long term colleague who has been working extremely actively for Miscanthus New Zealand Limited and has been using his ability to relate well to people, combined with his extensive network through rural New Zealand, to get things done. In addition, Lincoln University’s Dr Steve Wratten has been a major support to the development and use of Miscanthus and he has provided a completely independent – and positive – viewpoint on the value of use of Miscanthus on farms.

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Miscanthus in summer – 22 January – not to full height

The research reports that are included on this website under the Lincoln Research Project https://www.miscanthus.co.nz/lincoln/ are produced under his direction by a Ph.D. student, Chris Littlejohn. They have been both learning a lot and teaching us a lot over the past year.

And lastly, in conjunction with Lincoln University, Miscanthus New Zealand Limited has been asked by a major New Zealand company to put on the proposal to look at undertaking some significant research into production and use of Miscanthus in an industrial setting. At the time that this chat was due to be published, there was a lot of discussion going on about how this would best be done, how much time it would take to do it, and what the cost would be. There will be no decisions on this until about June, but once these decisions are made, then to the extent that it is not confidential, I will alert readers to developments.

Blog Post – January 2014

Well with all the rush of activity immediately prior to Christmas, the monthly chat was noticeable by its absence. This was accentuated by my wanting to delay posting another message until some interesting developments had come to fruition one way or the other. The other significant player in the Miscanthus business in New Zealand – the Taharoa C Block Incorporation – indicated to Miscanthus New Zealand Limited (MNZ) that they wished to cease involvement in Miscanthus in the future. They approached MNZ to see whether we would be interested in purchasing their assets. Naturally we were very interested and negotiations ensued. What was to be a short, sharp discussion and agreement on a suitable price for the approximately 60 tonnes of baled Miscanthus and approximately 8 or 9 hectares of Miscanthus established mainly at one site but also at several other trial sites, became a six week negotiation. Another competing party was bidding for these assets so MNZ had to pay more than it really wanted to in order to secure them. But agreement was reached, the money changed hands and we are still learning just what we purchased. Luckily, MNZ has been pleasantly surprised so far and MNZ has found that several opportunities that it did not expect to pursue until some time in the future, are now potentially viable in the coming year.

We will keep you informed of developments in this area. The Miscanthus that MNZ customers have established over the last few years almost all continue to thrive. The original Hawkes Bay planting was well over 2 metres by early December and the reasonably regular wet weather this season has helped in the development of the Miscanthus.

 

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Miscanthus in Hawkes Bay 6 December 2013. Fourth growing season. (with 1 metre rule) 2

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Third growing season Miscanthus (with 1 metre rule). Weeded on right. Unweeded on left.

 

One of the results of our purchase mentioned above, is that we now have access to another clone – namely Illinois clone. We will be putting in trials to assess the relative merits of the two clones on various sites in New Zealand.

Use of the Miscanthus harvested product for fuel, renewable diesel, stock bedding, emergency stock feed, garden mulch and other more technological uses is all being actively pursued by MNZ staff and associates. So if you are interested in any of these, get in touch with us. And the growing plants are being use for shelter and also now even being planted as cover for pheasants. The ingenuity of NZ’s primary industry people continues to surprise and please me.

Project Update January 2014

Biofuel feedstocks as co-products on dairy farms: income and sustainability benefits

Project Update. Period: to January 2014

Chris Littlejohn, Bio-Protection Research Centre, P O Box 85084, Lincoln University. p: +64 3 325 3838 extension: 8639 Mob. +64 2108204285
Funders; Westland Milk Products Ltd. and DairyNZ, + support from Agresearch and Lincoln University

Open/Download the PDF

Season Two

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Fig.1: Miscanthus plants December 30, 2013; Paddock 21, Aylesbury Farm. Planted December 2012.

 

Centre Pivot damage: effects on Miscanthus growth

As anticipated in Newsletter 10, damage to the Centre Pivot at Aylesbury Farm caused problems with some early-season Miscanthus (Mxg) growth but fortunately severe damage has occurred only with the shelterbelt in paddock 22. Pivot repair was finally completed on December 8 but due to part of the pivot falling onto the Mxg shelter in paddock 22 many of the plants were driven over during repair (Fig. 2). Plants were severely affected as illustrated by the difference in growth between those in paddock 22 (Fig. 2) compared to those in paddock 21 (Fig.3).

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Fig.2: Damage to Miscanthus plants; Paddock 22, Aylesbury arm, Dec 8, 2013.

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Fig.3: Growth with irrigation; Paddock 21, Aylesbury Farm, Dec 8, 2013.

 

The lack of irrigation on Aylesbury Farm was compounded by the fact that spring was very dry with only 20 mm of rain falling in November and only 7 mm in the last half of October. Soil moisture levels had fallen below that necessary to maintain grass growth by the end of October, ranging from 6 to 15 % by volume (0v) at this time. Fig. 4 illustrates the soil moisture profile for paddock 22 and expected values for wilting point and field capacity.

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Fig. 4: Calculated soil moisture release curve for Paddock 22 Aylesbury Farm, generated using soil pressure plates.

Soil water content held at low tension, present in macro and micropores, is readily available to the plants. Once the soil has reached field capacity any remaining water is held within micropores. As these pores are emptied, roots will draw from progressively smaller pores in which matric water potential is lower and the forces attracting water to soil surfaces, water tension, are greater. Therefore it will become more and more difficult for plants to remove water from the soil at a rate sufficient to meet their needs. At wilting point any soil moisture is held at too high a tension for the plants to extract and is unavailable to them. The soil moisture profile for paddock 22 shows that once soil moisture level falls below 22 % 0v any remaining moisture is unavailable to the plants. The soil becomes fully saturated at 36 % 0v and so the soil only holds 14 % 0v of available water. This, plus the fact that soil depth over most of the farm is between 24 and 35 cm and the farm often experiences dry windy conditions means the soil has low water storage ability and soon dries to wilting point in the absence of rain or irrigation. One of the potential benefits of the presence of Mxg shelterbelts will be to protect pasture plants from this drying wind and increase pasture production.

The fall in soil moisture levels meant some form of irrigation was needed and this was provided in part by establishing a network of K-lines across the farm. This allowed partial irrigation of parts of the farm which caused as well as solved problems for this research project. Paddock 21 miscanthus plants received 200 mm from K-line irrigation in November 2013 and consequently growth from this shelterbelt has been vigorous and uniform as illustrated by Figs.1 and 3. Most of the plants in this stand are now between 1.6 and 2 m tall. In contrast, paddock 6 picked up some moisture from irrigation on a neighbouring paddock on its northern boundary. The outer, northern row of plants grew relatively unhindered but other plants in the stand hardly grew at all (Fig. 5).

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Fig.5: Uneven growth; Paddock 6, Aylesbury Farm, Dec 17, 2013.

Mark Williams, Aylesbury Farm owner, kindly agreed to transfer some of his K-lines to irrigate the whole of the paddock 6 Mxg area for two days. This, as well as the subsequent pivot repair and high December rainfall has led to improved growth of previously water-stressed plants. Most are now between 1.1 and 1.5 m tall and plants across the shelter area now appear more even (Fig.6).

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Fig.6: Miscanthus growth; Paddock 6, Aylesbury Farm, Dec 30, 2013.

 

Paddock 22 has also now started to recover. During pivot repair it received no irrigation which resulted in the plants remaining dormant, which helped to minimise trampling damage from workmen and machines. All plants, even those that appeared dead, now have green shoots emerging and those that were not trampled have grown rapidly (Fig.7).

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Fig.7: Miscanthus growth; Paddock 22, Aylesbury Farm, Dec 30, 2013.

Centre Pivot damage: effects on pasture growth

One of the consequences of installing K-lines only in certain areas of Aylesbury Farm is that resulting uneven grass growth will potentially mask any benefits of shelter effect on grass growth (Fig.8). Since drought effects were experienced only for one month, there should be no significant long-term effects in grass production. To check this, C-Dax pasture readings and dry matter cuts were taken at the end of the drought period and these will be used when analysing subsequent grass growth readings later in the season.

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Fig.8: Differences in grass growth between irrigated and unirrigated areas, Aylesbury Farm, Dec 30, 2013.

Effects of Mxg plantings on biodiversity

As stated in Newsletter 10, to give information on the extent of weed management necessary to allow unhindered crop growth, winter weed control in Mxg plantings on Aylesbury Farm involved only removal of weeds immediately surrounding Mxg plants and at Springston Farm there was no weed control. Removal of all weeds would be normal practice to maximise crop growth however establishing ground cover between Mxg plants can help to develop habitat beneficial for insects. The vigorous nature of Mxg growth, particularly year three onwards, eliminates the need for weed control after season two. Results here indicate that removal of weeds immediately surrounding Mxg plants is sufficient to allow unhindered crop growth in season two as illustrated by Fig.9.

Since Mxg grows vertically rather than laterally, an open canopy exists at ground level, particularly in young stands. In a narrow strip this allows light penetration and ground cover plants to grow. In two of the three new paddocks that were planted on the 16 December 2013, Acaena inermis ‘purpurea’ (Rosaceae) plants will be planted amongst the Mxg plants to provide nectar and pollen for beneficial insects and to determine if these plants will survive in this environment.

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Fig.9: Minimal weed removal has allowed Mxg plants to grow unhindered while allowing a ground canopy to develop. Paddock 21, Aylesbury Farm, Dec 30, 2013.

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Bumble bee motel occupancy and skink refuge use

Bumble bee motels were restocked over the winter. In half of the compartments Pink Batts were used, the remaining half being stocked with a woollen blanket material. Previous research by Barron et al 2000 shows occupancy improves in season two and three after placement. Last season, no motels were used as nesting sites and this season only two out of 48 motels were occupied. Both compartments used contained Pink Batts, and both motels were in sheltered locations in paddock 6, one being in the Mxg shelterbelt and one in a thick gorse hedge. Hopefully next season an improvement in occupancy rate will be seen.

Skink refuge areas are starting to be used but only those placed within the Mxg. An intensive survey of occupancy rate will take place in March 2014.

Update on data logging equipment

Equipment to detect stomatal conductance in pasture plants and to monitor water-stress levels has arrived and is being calibrated for use in February 2014. The equipment will be set up on mobile trolley system and will be placed in the control and sheltered areas of paddock 21. The canopy temperature will then be used to directly indicate plant water stress levels in real-time and at the same time, soil moisture levels will be monitored. This work will provide information on whether water stress is reduced by shelter and also provide information on optimising irrigation efficiency.

Open Day

The open day which was provisionally organised for February 20, 2014 at Aylesbury Farm has been delayed due to the irrigation problems. This will now take place in late March or April and when the date is confirmed notifications will be sent out. In the meantime, a team from DairyNZ will be visiting trial plots on January 27th and a new date will be set soon after this.

Thanks

Thanks to those that have given their support to this project, in particular the funding from Westland Milk Products Ltd and DairyNZ, it is much appreciated. With the new plantings in December 2013 there are now six irrigated paddocks with shelterbelts in. This should enable sufficient data to be collected on the ecosystem benefits of using miscanthus as a shelterbelt crop on dairy farms. My 15 month report was completed and assessed favourably in November 2013 and a literature review is underway which will be submitted to relevant journals.

Happy New Year
Regards
Chris
Lincoln University

References

Barron MC, Wratten SD, Donovan BJ. 2000. A four year investigation into the efficacy of domiciles for enhancement of bumble bee populations.

Agricultural and Forest Entomology 2: 141-146

Blog Post – October 2013

The growing season for Miscanthus is well underway and even in areas that have not been harvested, the Miscanthus is shooting up extremely quickly. Three weeks ago at a site in the South Waikato area, the Miscanthus was already knee height and the change from one week to the next has been quite exciting to watch. Reports from Canterbury have indicated that while the Miscanthus started growing quite early, it does tend to get stopped by cold spells and then starts to grow again after the cold spell has finished. This is pretty much what we expected but it is interesting to see it being independently verified by the Lincoln research people. They have also established numerically, that Miscanthus performs much better in its first year if it is given good weed control. This past month has seen me take a trip to the USA, partly to follow up on the renewable diesel technology that I mentioned in last month’s chat, but also to go over to Illinois to meet researchers at the University of Illinois and to discuss various aspects of Miscanthus culture and use with them. I also visited Miscanthus growers and observed some very innovative multiple land use techniques combining Miscanthus and corn.

At the University, amongst other things I was shown 25-year-old Miscanthus that is still in production. I first saw this back in 2008 and to my eye it did not look any different now from what it looked like then. Unfortunately we visited the spot right at the very end of the day as the rain was starting so the only photograph I got of it (shown below) was not ideal.

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Miscanthus / corn mix on an Illinois farm

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25-year-old Miscanthus – in the background – at the University of Illinois

 

The two people in the photograph are Dr Tom Voigt – wearing the hat – and Eric Rund. Tom is the doyen of Miscanthus field research at the University and has a huge depth of knowledge about Miscanthus and what it is possible to do with it. Eric in turn could be called “Mr Miscanthus” for his part of the world because he is not only an enthusiast but is also a practical farmer and is not scared to try new techniques and work out how to make them commercially productive. This trip was a good example of how cooperative people who are involved in the Miscanthus business are with each other. The University of Illinois staff and the local growers have always been extremely helpful in providing the expertise to assist development of our activities in New Zealand. This particular trip was different from previous ones in that for the first time, Miscanthus New Zealand limited was able to provide the international experts, information that should prove to be useful to them. One of the researcher with whom I met – Dr Jack Juvik – has a Ph.D. student involved in breeding of new Miscanthus x giganteus crosses and it does seem that they are being very successful with this. As soon as they have competed any trials and established which ones have the best production, we will look to import some of these clones to New Zealand as well as the clones that we already have here. Things have been very hectic over the past month and as a result posting of this chat message is later than it really should be. The result is that although it may be shorter than the normal chats, it does set the scene for further developments in the coming months.

Project Update September 2013

Biofuel feedstocks as co-products on dairy farms: income and sustainability benefits.

Project Update. Period: to Sept 29, 2013

Chris Littlejohn, Bio-Protection Research Centre, P O Box 85084, Lincoln University. p: +64 3 325 3838 extension: 8639 Mob. +64 2108204285
Funders; Westland Milk Products and DairyNZ, + support from Agresearch

Open/Download the PDF

Spring Update; Season Two

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Fig.1: Miscanthus plants September 7, 2013; paddock 22 Aylesbury farm.

Crop News

The first signs of re-growth started to appear at the beginning of September. Stems that senesced over the winter remained soft and did not stiffen to produce harder stems, as had been expected (Fig.2).

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Fig.2: Last summer’s stems after moving their nutrient content to the rhizome; paddock 22, Aylesbury Farm, Oct 7, 2013.[/mks_one_half]

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Fig.3: Leaf growth from the top of previously-senesced stems; paddock 22, Aylesbury Farm, Oct 7, 2013.

 

This may be a feature of first season’s growth or may have been a consequence of the relatively mild winter resulting in a slower rate of nutrient transfer. M. x gianteus (Mxg) is not harvested in its first season but when considering future harvest date research (Lewandowski and Heinz 2003) shows energy yield is reduced the later the harvest date, due to nutrient content decreasing as nutrients are translocated to the rhizome. Interestingly some of these stems greened up again in September and initially produced leaves (Figs. 3 and 4) but these died back during a period of frosty mornings.

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Fig. 4: Greening of Miscanthus stems; paddock 6, September 7, 2013 Aylesbury Farm

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Fig.5: Miscanthus shoots first appeared at the beginning of September; paddock 21 Aylesbury Farm.

 

Early September also saw the first appearance of new shoots (Fig 5). Frequent frosts and a lowering in soil temperatures kept any further regrowth in check until the end of September when significant sprouting and growth from the base of plants was visible (Fig.6).

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Fig.6: Vigorous growth from Mxg plants; paddock 6, Aylesbury Farm, Oct 1, 2013.

Whether this spring growth is again is checked by late frosts will be interesting to see. Zub and Brancourt-Hulmel’s (2009) research on crop production in Europe suggests frost tolerance is a breed trait that needs to be improved if Mxg is to be produced in colder regions. Their research indicates susceptibility to winter frost at temperatures below −8 °C for rhizomes and −3.5 °C for young shoots of Mxg can lead to significant plant losses and lower yields. Research by Lewandowski et al (2000) also indicates that in the first winter following planting, the rather shallow and under-developed rhizomes can often be damaged or destroyed by cold and or wet conditions. There are no reports of over-wintering problems in the second and subsequent winters. This year’s relatively mild Canterbury winter should prove to be a bonus to this season’s plant growth and well developed shelterbelts should be the outcome from those Mxg plantings in irrigated paddocks. This is providing that the damage caused to the centre pivot at Aylesbury Farm by the recent storm that hit the region on the September 10 (Fig.7) is repaired before water stress levels become too severe. The immediate area surrounding Aylesbury Farm suffered extensive tree damage, something that would not occur with Miscanthus shelterbelts at this time of year as above ground material would have been harvested or senesced. With harvested plots no stock shelter would be available but with senesced plants some shelter protection is still present.

If high Mxg yields of 30 Tonnes-1 ha or more are to be achieved in the Canterbury region then lasts years growth studies, where irrigated plants were on average a metre taller than unirrigated ones, indicates that irrigation is essential. The observations of frost effect on young growth also suggest that in particularly cold winters mulching may be necessary to mitigate any crop damage in the first winter.

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Fig.7: Damage to the Centre Pivot at Aylesbury Farm, September 12, 2013

Effects of Mxg plantings on biodiversity

Research in Europe (Semere and Slater 2006) showed that since perennial rhizomatous grasses require a single initial planting and tillage only at time of planting, and also no major chemical inputs, and where the crops are harvested in the spring and the land is not disturbed by cultivation every year, the fields were used as over-wintering sites for invertebrates, suggesting immediate benefits to biodiversity. Similar studies have also shown variable benefits for woodland bird species depending on canopy density, weediness and stage of growth. Winter weed control has been minimal in Mxg plantings on Aylesbury Farm and only the removal of any weeds at the base of each plant was performed once sprouting had been observed (Fig. 5). In the only one remaining Mxg planting on Springston Farm, which is partially irrigated, there has been no weed control to see if Mxg plants will push through the existing weed cover. This will give information on levels of weed control necessary to allow unhindered crop growth. All the remaining plots which were unirrigated and had poor growth last season have had blanket spraying of a broad leaved herbicide to remove weed so as to help initial growth of these weaker plants.

Research work over the winter months

Winter months have been spent analysing base-line data which will be used to benchmark any shelter effects in the coming seasons and preparing progress reports. Further soil analysis has been undertaken and soil moisture profiles prepared. This will form an important part of analysis of varying pasture water stress levels due to shelter effect. Bumble motels have been serviced and restocked with bedding material and baseline earthworm counts have been taken. A fifteen month progress report has been submitted to Lincoln University and this will be supported by a presentation on 20 Oct 2013.

DairyNZ provide funding support

One successful outcome of winter activities has been a successful funding application to DairyNZ for data-logging equipment. The allocation of $25,000 will be used to purchase real time monitoring equipment which will be used to assess pasture water stress using canopy temperature as an index. Plants suffering water stress will close their stomata which results in an increase in leaf temperature due to reduced evapotranspiration. This can be detected using infra-red thermometers and used to calculate stomatal conductance. Equipment will be set up to try and achieve this and a hand held porometer, which directly measures stomatal conductance, will be used to calibrate readings. The canopy temperature will then be used to directly indicate plant water stress levels in real-time and at the same time soil moisture levels will be monitored. This work will provide information on whether water stress levels are reduced by shelter and also provide information on optimising irrigation efficiency.

DairyNZ will also help promote methods of best practice for growing Mxg on dairy farms which will also be generated by this research. This contribution is very much appreciated and complements the support provided by Westland Milk Products.

Open Day

An open day has been organised for 20 February 2014 at Aylesbury Farm to provide information on the agronomy of Mxg, research results gained so far and to illustrate the shelter effect of Mxg as by then it should be 3 m high. The aim is to illustrate, using existing plantings, how miscanthus can fit into the dairy production system. Westland Milk Products and DairyNZ will be helping to organise the day. Specialists from DairyNZ, Westland Milk Products, Agresearch and Lincoln University will be present. DairyNZ will be assisting in producing publication material and a BBQ will be provided. A reminder will be posted nearer the time but please put the date in your diaries.

The future of Miscanthus in New Zealand

Negotiations and planning are well under way between Lincoln University and a Californian company to develop in New Zealand a small-scale, portable unit which makes 150 litres-1 hour of renewable diesel. The ‘drop-in’ renewable diesel can be made, through a catalytic process, from any cellulosic material, including miscanthus, cardboard, paper, straw etc. This product can be used as boiler fuel or for transport and has been approved by the state of California as a road fuel with no further treatment – unlike biodiesel from plant oils where transesterification is needed. Prof. Steve Wratten of the Bio-Protection Centre at Lincoln University and Peter Brown from Miscanthus New Zealand Ltd will have a meeting with the California Company later in October.

Chris Littlejohn

References

Lewandowski I, Heinz A (2003). Delayed harvest of miscanthus—influences on biomass quantity and quality and environmental impacts of energy production. European Journal of Agronomy 19, 45-63.

Lewandowski, I. , Clifton-Brownb,I., Scurlockc,J. and Huismand,W., (2000). European experience with a novel energy crop. Biomass and Bioenergy Volume 19, Issue 4, October 2000, Pages 209–227

Semere, T et Slater F.M (2007). Invertebrate populations in miscanthus and reed canary-grass. Biomass and Bioenergy 31 : 30 – 39.

Zub, H. and Brancourt-Hulmel, M (2009 ) Agronomic and physiological performances of different species of Miscanthus, a major energy crop. A review Agronomy for Sustainable Development, Volume 30, Number 2, April 2009 , pp. 201-214(14)