Ecodyfi is working with local farmers and growers to trial a new technique of crop fertilisation. Perennial green manures are fertilisers made from plant material grown in biodiverse areas of coppice woodland and perennial plantings. Much like the fertility-building clovers and vetches long-used by farmers, nitrogen fixing trees and shrubs such as alder trees and gorse bushes work with bacteria in the soil to convert nitrogen into a form useful to plants.

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Using this method, farmers will grow their fertiliser in the form of nitrogen-rich tree leaves which are cut when green and added to cropland. These fertiliser-producing areas will be situated on less productive areas of farms such as steep slopes or boggy ground. They will  also serve as biodiversity reserves and build up carbon stores in roots and soil. It is hoped that the technique will help farmers meet some of the many challenges they are facing, include fast-rising fertiliser costs alongside the need to increase tree cover for habitat restoration and carbon sequestration.

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Initial work at Bangor University has given promising results in scientifically controlled and monitored experiments. These include lower greenhouse gas emissions from soil fertilised with alder leaves compared to that fertilised with manufactured fertilisers and traditional clover green manure. The next step is to trial the technique on crops on working farms. Here in the Dyfi Valley there is a growing trend towards re-establishing the cereal and vegetable growing which has historically been part of our agricultural landscape.  (https://www.dyfibiosphere.wales/mixed-farming-histories-and-futures). Ecodyfi has to recruited some of these local producers to trial perennial green manures in comparison to their usual method of fertilisation.

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