Click on “Download PDF” for the PDF version or on the title for the HTML version. If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options. Management Guidelines for Precision Farming : NitrogenPublished 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) @2002Authors: 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. (Download PDF) (Export to EndNotes)
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