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N requirements of straw incorporation (prev NT0501) - NT1505

Description
Incorporation of straw into soils may lead to an accumulation of soil N which would previously have been lost to the atmosphere through burning (now banned). Any resulting long term increase in soil organic N content may lead to enhanced mineralization of N; if this occurs in autumn-early winter, increased nitrate leaching losses may be the result, negating any short-term N immobilisation benefits of straw incorporation. This study will aim to evaluate the effects of straw incorporation on soil mineral N supply, crop fertiliser N requirements and nitrate leaching losses. Experiments will be conducted on 3 sites (consisting of clay, light sandy and medium loam soils) to determine the effects of straw incorporation compared to straw burning on soil mineral N supply, crop yields, fertiliser N requirements and nitrate leaching losses. Results from the study will improve understanding of the effects of straw incorporation compared to burning on the soil N cycle (particularly immobilisation-mineralization dynamics), requirements for fertiliser N to achieve optimum yields, and effects on nitrate leaching losses. Data obtained will also be useful for modelling the soil N cycle.
Project Documents
• Final Report : N requirements of straw incorporation (prev NT0501)   (179k)
Time-Scale and Cost
From: 1995

To: 1998

Cost: £236,355
Contractor / Funded Organisations
ADAS UK Ltd.
Keywords
              
Fields of Study
Fertilisers and Nitrate Pollution