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Immobilisation of N by straw incorporation (Previously NT0502) - NT1506

The value of straw incorporation in decreasing nitrate leaching from soils is unclear and needs to be more fully understood in order to learn how to better manage agricultural systems to minimise nitrate leaching. This study will aim to determine the short- and long-term effects of straw incorporation on soil microbial and N dynamics, with special reference to nitrate leaching, in soils of different types and under different management regimes (e.g. straw ploughed in, shallow till). 15N-labelled straw and fertiliser in the field will be used to assess the contribution of straw-N, soil N and added fertiliser to N uptake by the soil microbial biomass as it decomposes incorporated straw. Data obtained will be used to develop a model to predict short-and long-term effects of straw incorporation on soil N dynamics and nitrate leaching. Data will also be entered into the N mineralization database devised in Project NT1503. Results will be communicated in the form of published papers and will have important implications for crop residue disposal, nitrate leaching, fertilizer application rates and organic matter dynamics in arable soils.
Project Documents
• Executive Summary : Immobilisation of N by straw incorporation (Previously NT0502)   (34k)
Time-Scale and Cost
From: 1995

To: 1998

Cost: £227,634
Contractor / Funded Organisations
Rothamsted Research (BBSRC)
Fields of Study
Fertilisers and Nitrate Pollution