Nitrogen Supply and Management in Organic Farming

Summary

This topic review aims to summarise knowledge and experience of Nitrogen supply and management in organic farming systems, including : Nitrogen fixation; Nitrogen recycling; the effect of the length of the fertility building phase or ley and the effect of green cover management; green manures – type and management; soil management; the impact of undersowing; seasonality of crops and the impact of manure use and management. It is based on a review of the organic research commissioned by Defra and that undertaken elsewhere and incorporates field experiences in the conclusions.