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Organic Matter Microbial Biomass NH 4 + NO 3 - Immobilisation Nitrification Ammonification Death & decomposition Mineral N Organic Matter Mineral N Approximate N content (kg ha -1 ) : 2000-20000 10-500 Mineralisation Importance of N in soil organic matter But still no quick and easy way of predicting N release from soils
Estimate or measure N content (RB209; MANNER); make allowance when calculating fertiliser applications
Recycle effectively – band spreading; injection
Where possible, apply from late winter onwards
Measure application rate
Manure Management Plan
‘ Tried & Tested’ SNS calculator You can use our SNS calculator to help you determine the Soil Nitrogen Supply of your soil. You will need this index number when using the ‘Fertiliser Manual (RB209)’ for guidance on fertiliser application rates. Tried & Tested SNS Calculator
Improving NUE involves assessing risk and eliminating ‘leaky’ practices N leached (kg ha -1 )
Acknowledgements Rothamsted Research is an institute of the UK Biotechnology and Biological Sciences Research Council. The UK Department for Environment, Food and Rural Affairs funded some of the research described in this talk.