Tuesday, 29 January 2019

Cover Crop Benefits


Catchment Sensitive Farmers Meeting
I had a really fascinating day in Dorset today, exploring the use of cover crops to capture nutrients, (mainly nitrates) and stop them being washed through the soil profile and into ground water. The day was organised by Wessex Water and the Catchment Sensitive Farming organisation. Fellow Nuffield Scholar Tim Stephens and his team have put together a matrix of different cover crop species and seeding rates to look at establishment, nutrient capture and suitability within the field. The catchment also has porous dotted around the fields and every 2 weeks from October to the end of January samples are taken and the levels of nitrate in the water assessed. These values are then turned in to a Kg/Ha of nitrogen to give farmers a vital guide as to where leaching is occurring in the farming rotation and how much is being lost and when leaching occurs.
It seems that the worst leaching occurs after Oilseed Rape and Wheat, probably due to the higher levels of fertiliser they receive but also due to the very inefficient way these plants use the applied nitrogen. Wheat for example is only about 60% efficient when looking at applied or synthetic nitrogen fertiliser. Where cover crops are used the leached level of nitrogen is about 50% that of land farmed without cover crops. This has a significant impact when looking at the catchment as a whole. It is great credit to Wessex Water that they have decided to take this partnership approach to try and reduce diffuse pollution working together with the farmers in the catchment.

Beneficial and Pest Numbers in the Cover Crops
Also on hand were a team of entomologists who have been assessing the impact of cover crops on the insect population. The picture above shows the numbers of insects trapped over a 7 day period. The 2 trays on the left show the beneficial's and on the right are the pests. The top half shows the numbers and type captured in the cover crop field (oil radish and phacelia) and the bottom half shows what was captured from a control field i.e. no cover crop. This level of detail is very encouraging. This clearly demonstrates that cover crops are hosting higher insect levels all round but significantly more beneficial insects that will predate the pests. This is so important when looking at using an Integrated Farm Management approach to try and reduce the amount of pesticides we might want or need to use. There were lots of carabid beetles, who's larvae predate slugs which is also very positive. The benefits weren't just in this cover crop species mix. the photo below shows what was captured within a buckwheat, oil radish and phacelia mix. The predator list includes, carabid beetles, springtails, harvestman spiders (not really spiders at all), ants, spiders, and parasitic wasps. The pest list includes mites, flies, aphids, snails and a slug.
Beneficial Insects and Pests trapped from Cover Crops
The session continued in the local village hall with a great presentation on 'Making the Most of Cover Crops' by Ian from Oakbank. Ian talked about different cover crop mixes, how and when to establish them, and the merits of diverse mixes and the impact of this type of farming can have to the on the bottom line and the better environment. A great day of learning.


Monday, 14 January 2019

Inter-Cropping Insight

Inter-cropping Sprayed Off
Back when we planted the oilseed rape crops in August we also planted their companion crops. This year we used 10Kg of vetch and 2kg of  Berseem clover/per hectare. These companions have grown very successfully through the autumn and into the winter. During the winter we sprayed a weed killer on most of the crop to remove the companion crops as well as weeds like sow thistle, mayweed, brome and black-grass. This herbicide does not affect the oilseed rape crop. Both of these legume crops are able to host soil bacteria to make plant available nitrogen from the atmosphere, something that the oilseed rape crop in unable to do. We hope that as much as 30-50Kg/ha of nitrogen will be available free of charge from these companion crops, easily covering the initial cost of the seed. This could be worth between £25-£41/Ha.
Canopy of Sprayed Off Inter-cropping
The picture above shows the crop where the companion crop has been sprayed off. We can measure the GAi (Green Area Index) or amount of green plant material with an app on a mobile phone. This picture shows a GAi of 1.34. There is about 50Kg/Ha of nitrogen in every GAi of an oilseed rape crop. Therefore this crop has captured 67Kg of Nitrogen. The picture below, where the companion hasn't been sprayed off, has a GAi of 3.05 indicating a potential level of 152Kg/ha of nitrogen in this whole canopy. Whether all of this canopy will relate to available nutrients for the oilseed crop to capture is something we don't know but its very interesting to see these levels of free nitrogen, even accounting for the 25Kg of fertiliser applied at planting.
Canopy Of Inter-cropping
We are planning to leave this area of the field until harvest to see what effect it has on the overall yield of the combined species. We should be able to reduce the amount of nitrogen this part of the field receives in order to keep the crop standing but also to rely on the nitrogen being created by the vetches and passed over to the oilseed rape. Time will tell what the outcome will be!

Thursday, 20 December 2018

Conservation Cattle

Red Poll Cattle Grazing Old Grassland

This winter we have an exciting new project on the summit of Bredon Hill. At about 950ft above sea level we have some very thin soil which has been growing enough grass for our sheep since about 1990 when it was converted from crop production. All of the grasses and wild flowers have naturally appeared from the soil seed bank or from birds bringing them in. 
The grassland has become quite old and matted so a change in grazing technique was required. As we have cattle of our own we have very kindly adopted, for a few weeks, some young heifers from the Kemerton pedigree Red Poll herd. Their job is to eat the standing grass, which as this time of year is like a hay crop, and tread in the inedible bits. All of these hooves will push the uneaten old and dead grass into the soil where the biology (bacteria and fungi) will start to break down the material and recycle the nutrients.
Over time this will improve the quality of the grassland enabling wider species to be introduced. The cattle are being fed hay, which we made back in July, from the species rich tower field with the hope that these ancient species will be moved across to improve the diversity of the sward in the neighbouring fields. The cattle will be socked quite tightly to make sure they eat the right amount of grass and moved on accordingly, always with a supply of hay nearby.
It's a great example of how farmers can work together to get the best results for all parties. These cattle are traditional breeds and will be very happy on the hill whatever the British climate will throw at them.

Sunday, 16 December 2018

Aphid Alert

Wheat Drilled into Oat Stubbles
I think this could have possibly been one of the best autumns for establishing winter crops I can remember for quite some time. After the very dry summer months we started to get rain at just about the right time. This rain enabled weeds to germinate in the stubble's and cover crops before the main crops were planted. We had enough rain over the planting period to make sure that the seeds we planted germinated rapidly and emerged very quickly.
This year we have only used seed dressings with Zinc and Manganese on them to kick start the growth of the young plants, except on 1 block of barley we are growing for seed. Every year we have tested leaves for deficiency and these trace elements have always come up short.
One dilemma I have had is whether or not we should be spraying an autumn insecticide to control aphids. The aphids (Bird Cherry-Oat and Grain Aphids) could be carrying a virus called Barley Yellow Dwarf Virus which stunts the growth of plants and reduces yield. The only problem is you don't know if the aphids in our crops are carrying the virus and if the plants have been infected until the spring, when its too late to treat. The AHDB has developed a tool to assess when you should spray for aphids. This can play a crucial role when we are using Integrated Pest Management to responsibly use pesticides. This means that when we see a pest, we monitor its development and then spray with the correct product, with the correct amount of water and the correct dose rate to take the pest out. The tool can be found HERE 
As we are trying to reduce the levels of insecticide we apply on our fields I have decided not to spray half of the wheat area that was later planted but rely on our beneficial predators to help reduce the numbers of aphids. There are always lots of spiders webs across the fields and the aphids should provide a tasty snack! The Game and Wildlife Conservation Trust did some research which indicated that the effect on beneficial insects of that autumn spray was still apparent the following June.
Providing grassy margins around our field boundaries and beetle banks within larger fields also help create habitat for beneficial insects to live ready to strike at invading aphids. We will see in the spring whether or not this was a good decision! We need a good hard winter to help kill off as many aphids as possible.

Friday, 9 November 2018

Cabbage Stem Flea Beetle



Well what a trying autumn it has been for our oilseed rape crops! 2 years ago the EU restricted the use of, and has subsequently banned neonicotinoid seed dressing on our crops. These insecticide seed dressings were a valuable tool in terms of getting crops established when dealing with a tricky pest called Cabbage Stem Flea Beetle. The insecticide was applied to the seed and when the plant grew the chemical was taken in by the plant. This meant that when the beetle took a bite out of the plant leaves it received a dose of insecticide and died. This meant that we didn't have to spray for the pests when the crop had emerged with an indiscriminate insecticide across the whole field. There are parts of the country where it has become impossible to grow these crops anymore. Why should that be a problem? For several reasons oilseed rape is a very important crop. It enables farmers to have a rotation, growing different crops in the field every year rather than continuous cereals. It's actually pretty profitable, which means we can invest in our farms and the countryside. The oil that it produces is valuable to the country as its turned into bio diesel and vegetable oils, and the yellow flowers are a really important source of pollen and nectar for bees producing honey.
If the UK stopped growing oilseed rape, the grains would still be imported from abroad. Last year 200,000 Tonnes of oilseed rape was imported from Australia, where these chemicals (and others), banned in the EU, are still permitted. So in effect we would be exporting our environmental  conscious abroad.
We have learnt a lot from the this years establishment of the crop.  There are a lot of practical, physical tools that we can apply using the principles of IPM (Integrated Pest Management). Drilling date has been key to getting crops established and to have grown at least a true leaf before the beetles attack. The weather and crucially moisture at drilling is key to getting oilseed rape established quickly. Direct drilling helps retain valuable moisture at this key timing for the crop. Placed fertiliser enables a quick get away when the plant starts to grow. High levels of crop residue also help conceal the crop from the beetles, but comes with the added issues of slugs hiding in the straw ready to pounce. For the last 4 years we have been planting companion crops (buckwheat, vetch and clover) to help mask the crop still further. These companions also have benefits of weed suppression and the legumes are able to fix a certain amount of free nitrogen from the atmosphere.
We haven't sprayed any insecticide on the oilseed rape crops this year. Partly because we are trying to farm without using insecticides as we want to encourage our beneficial insects to predate the pests and partly due to the fact that I am not sure exactly how efficient they are due to pest resistance. It seems that they are becoming resistant to the active ingredient so their extended use is probably not justified.
Either way new research is needed to find out more about the pest and how we can manage or disrupt its life cycle. What percentage of the population is resistant? What environmental trigger makes them hatch?  How long is the feeding period for?
These are some of the issues faced on the farm by one crop and one pest. We have a massive challenge to maintain active ingredients that enable us to continue to grow food in the UK. Food sovereignty should be very much at the fore front of the thinking of the population in a post EU world but we will need to tools that will unable us to product this food for an ever increasing population.

Sunday, 14 October 2018

Harvest Roundup

Harvest 2018 was a very interesting time with some very strange results, although probably not surprising considering the weather that has been thrown at the crops this year. The weather went from a very late cold spring (snow ploughing at the start of March), through to a warm spell at the end of April and then straight into summer. We had some rain at the end of May and then into a very hot and dry June (3.8mm) and July (36mm). The winter crops didn't fair too badly on the whole and grain quality was fantastic. The milling wheat averaged about 10% down from our rolling average and proteins were very high, and with good hagbergs (stretchyness for flour). We trialled a new monitor, called a Crop Scan in the combine this year which measures the protein levels of the grain as we harvested. This gave us some very valuable real time information of crop quality. It also showed the grain moisture. This was installed by Precision Decisions and supplied by Agri-EPI and is a very interesting piece of farm equipment.
Winter Oilseed rape was down 10% but the winter malting barley actually increased its yield from last year. The disappointment came when we started combining the spring crops. These were typically 30% down on our historic yields, although quality was good. The recent increase in prices due to lower world yields will not make up the financial difference incased by lower yields. On the plus side we didn't need to buy any diesel for drying the grain and all of the farm machinery behaved very well with no real hiccups!

Sunday, 17 June 2018

#YourHarvest, Get the Message Out There

At the Cereals Event Tom Bradshaw, (National Farmers Union - Crops Board Chairman) launched a campaign to highlight the importance of the arable sector; raising awareness of its importance to many other sectors of UK Agriculture. Much of the grain we produce goes to feed poultry, pigs, cattle and sheep, in addition to supplying us with bread, beer and proteins. Without a profitable and vibrant arable sector this could open the door to cheaper imports, produced to lower standards, using chemicals and products that are not registered or licensed in the UK.
Grain is probably one of the easiest crops to store and then export around the world. If stored correctly it will last for years. The infrastructure is in place around the world to move grain from farms to ports and then its a relatively cheap cost to move that grain around the world. This could give us opportunities, if we can produce quality wheat but that is not reliable year on year due to the vagaries of the UK summer weather.Realistically the UK only produces about 1% of the worlds wheat-we are small fish in a very large commodity pond.
So here is the idea. If you are an arable farmer (or any farmer for that matter) use this harvest as an opportunity to show people what you do; what you grow and how that is relevant to everyone else in the country. Tweet loads of pictures of #YourHarvest and use the hashtag.
Find your local MP and invite them out to the farm. In fact invite those from neighbouring constituencies as well and spend a few hours doing a spot of show and tell. Remind them about the technology we use to ensure we are efficient with our crop inputs, that pesticides and fertiliser applied stay in the field. Show them the margins with wildflowers; the wild birdseed mixtures; the fallow plots and the woodland, the new hedges and the trees planted. We have to get this message across. 2 hours is nothing compared to what is at stake over the next 25 years.