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Development of user-friendly systems for on-farm estimation of the available nitrogen content in solid manures/slurries - NT1408

This study will aim to improve understanding of N pathways in forage maize crops in order to form the basis of a new recommendation system that will enable and encourage farmers to better utilise manure N. Specifically, the main objective will be to develop strategies for soil mineral N (SMN) measurements to highlight the nutrients available from manures and to provide information on the need for supplementary inorganic fertiliser where necessary. The study will be composed of 3 research components outlined as follows: 1. Development of a statistical relationship between DM yield, N uptake in maize and total N supply from inorganic fertilisers and other sources; 2. Development of a programme of 5 field trials sited in major UK maize growing areas. Each trial will provide 4 rates of slurry N application factorially combined with 4 rates of inorganic N application and will be taken to final yield. Slurry will be applied 4--6 weeks after drilling, and SMN will be measured before slurry application, one week before drilling, 8 weeks after drilling and at final harvest; and 3. Development of quantified relationships between N inputs from organic and inorganic sources, SMN and N uptake by maize by combining past and new data. Based on these relationships, the most suitable timing and depth of SMN measurement for use in a practical recommendation system for the use of inorganic N fertilisers will be identified.
Time-Scale and Cost
From: 1995

To: 1998

Cost: £107,380
Contractor / Funded Organisations
Institute of Grassland and Environment Research (IGER), ADAS UK Ltd.
Fields of Study
Fertilisers and Nitrate Pollution