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Refining the use of soil organic matter as an indicator of soil N supply (for AU NT21) - NT1525

Cereal N response experiments may be used to provide estimates of soil N supply throughout the growing season (provided that soil and crop N have been measured in spring and at harvest), which may be used to provide fertiliser recommendations. This study will examine the relationship between soil N supply and soil organic matter which is at a level of <6%. The study will be composed of 4 objectives, which are outlined as follows, together with ways in which they might be achieved: 1. Collation of a database of at least 50 cereal experiments, thus providing estimates of soil N supply across a range of soil organic matter levels. The database will be used to identify nil N-fertilised cereal plots on which soil and crop N measurements have been taken in spring and at harvest - these will be used to obtain an estimate of net N mineralization; 2. Analysis of relationships between soil N supply and soil organic matter across sites identified in objective 1. This will be undertaken using standard data handling software to determine existence of relationships between net N supply and soil organic matter; 3. Reporting of conclusions to MAFF; and 4. Drafting of a scientific paper if the outcome is sufficient to warrant publication. Results will be made available to all interested parties through publication in a refereed journal and will be used to refine fertiliser recommendations for cereals, thus reducing environmental effects of N.
Time-Scale and Cost
From: 1997

To: 1998

Cost: £15,089
Contractor / Funded Organisations
Fields of Study
Fertilisers and Nitrate Pollution