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Research shows limited benefit from variable rate nitrogen

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New ADAS research has revealed that varying nitrogen fertiliser rates within a field delivered only minor improvements to yield, gross margin, and greenhouse gas emissions compared to a flat optimum nitrogen rate for winter wheat, winter barley, and oilseed rape. The research, conducted across 11 commercial farms in the UK over 5 years, found that on average, variable rate nitrogen (VRN) applications would have increased yields by only about 0.05 t/ha and improved profits by roughly £10/ha The environmental benefits of VRN were also modest, with only small reductions in greenhouse gas (GHG) emissions per tonne of crop produced. ADAS…