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Management Guidelines for Precision Farming : Nitrogen

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  021018,  2002 ASAE Annual Meeting . (doi: 10.13031/2013.9298) @2002
Authors:   R J Godwin, G.A.Wood, J.C.Taylor, R. Earl, S. Knight, J. Welsh, B S Blackmore
Keywords:   Precision farming, nitrogen, fertilizer, winter wheat, NDVI, yield maps

The results of a 6 year study to develop practical management strategies for spatially developing nitrogen are reported. The results show that there are significant advantages from spatially varying nitrogen application rate in real time using the crop density of winter wheat in the spring period. Average economic benefits of 22/ha have been found together with a one third reduction in the residual nitrogen. From these results a strategy has been developed to aid farmers in varying the application rate of nitrogen given the crop status at selected growth stages. Yield maps where shown to be of little value for deciding upon the next seasons nitrogen application; there are however, valuable indicators for the replenishment of phosphorous and potassium.

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