Professor Jacob Weiner, University of Copenhagen: 10th of June 2016

This was my last visit on my foreign part of my Nuffield travels. I have one more visit in the UK planned and then I need to knuckle down to write my report. Jacob had the honour of being my last foreign visit. Jacob is an American who has worked all around the world but has now settled in Denmark. He has done work on intercropping and companion planting. Recently he has been working in China ( more research money there). His colleagues in China have had great results with intercropping and got very large yield increases. They have poor Loess soils and this is why he thinks they get advantages through intercropping. Jacob not so sure in the West we will see the large yield increases but we will see many other advantages especially of lowering inputs and safeguarding the environment.

Recently Jacob has been working on the OSCAR project which is a European wide research project into cover cropping and intercropping:


Jacob was specifically looking at the use of Subterreanean Clover in cereals in the Mediterranean. Sub-clover is very interesting as it is low growing and seeds underground. Ideal as a companion. The problem is it is difficult to establish and needs water otherwise it competes too much with the main crop. Also we need new varieties which are suited better to the UK climate.

The other research Jacob has been doing is looking into seeding patterns and its effects on weeds. This work is the reason I contacted him as I saw a feature in “The Furrow” magazine. Jacob has been looking at inter row spacing and intra row spacing. Ideally the distances want to be 45mm for both. This means the need for more precise seeding technology and also a doubling of seed rates. He has had some great results. In the trials they planted their weed (WOSR) and did different seed rates and seeding patterns. The results can be seen below:




He has got 72% weed control from both high seed rates and uniform seeding. The uniform seeding alone gave an 30% advantage in weed control.

The final idea we discussed was “evolutionary theory in agriculture “. Basically evolution is not necessarily the best thing for agriculture. In a field of wheat for example you don’t necessarily want the best yielding individual plants as they can disadvantage their neighbours, you want the plants that work best as a community. You want the best yield per hectare not yield per plant. This goes against most thinking in plant breeding and is not a popular idea with his peers. It also has repercussions for varietal mixtures and intercropping. The best varities for intercropping will not necessarily be the highest yielding, they need to be social plant. Also this theory applies to managing varietal mixtures. You do not want to leave them to evolve to selfish individuals. You want to add new genetics to stop the gene pool of the mixtures narrowing.

After seeing Jacob we went to the Inaugural lecture of a new professor here looking at biological time machines



The proffesor was working on climate change. The was trying to look into the future effects of changing temperatures, rainfall and CO2 through outdoor experiments to try to predict the ecosystem effects of climate change into the future and the effects on plant communities. He was saying it is hard to work with a multi factorial, outdoor environment which is changes each year, he should try FARMING!

After the lecture we had a free lunch and drinks reception and then my last foreign visit was over. I have had an amazing time on my travels and learnt so much. The best things has been meeting new contacts and making new friends which is invaluable. Anyone thinking of applying for a Nuffield Scholarship “just do it!”




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