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Management practices, leaching and efficiency of nitrogen use (Previously NT0102) - NT1203

In order to restrict nitrate leaching from arable land and to minimise the need to compensate farmers for consequent losses of yield, it is necessary to identify or devise practices which maximise crop recovery of soil nitrogen (N) and provide the most effective supplementation with fertiliser N. Such practices could then be used to improve guidelines for crop husbandry and efficient fertiliser use over a range of soil types. This study will aim to produce such guidelines, on the basis of improved estimation of N levels in soils, according to patterns of N applications in recent seasons and estimation of N losses to drainage waters, soil and atmosphere. Findings of previous studies will be consolidated to provide an accurate assessment of: N residues resulting from cropping of sugar beet and peas; N requirements on chalky, sandy and organic soils; the particular responses of spring barley, winter oats and oilseed rape; the comparability of ammonium nitrate and urea as fertilisers; and the basis for adjustment of fertiliser application according to expected yield of winter wheat and winter barley. Guidelines will be prepared for reduction of N losses on sandy soils, and knowledge of the way in which yield affecting factors affect use of fertiliser N will be improved.
Time-Scale and Cost
From: 1995

To: 1996

Cost: £123,000
Contractor / Funded Organisations
Fields of Study
Fertilisers and Nitrate Pollution