Summary
The extent to which fertilizer N applied to soil could be recovered by conventional soil analysis for mineral N was studied in 15 N-fertilizer experiments on potatoes. In seven of them up to 85% of the fertilizer N apparently disappeared and then reappeared during the subsequent five weeks. When “disappearance” was plotted against time from fertilizer application the points fitted approximately about the same curve despite the soils differing widely in organic-matter content, pH and texture. It appears that soil sampling for giving advice on fertilizer-N levels should be delayed for a substantial period after an application of fertilizer N.
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Neeteson, J.J., Greenwood, D.J. & Habets, E.J.M.H. Dependence of soil mineral N on N-fertilizer application. Plant Soil 91, 417–420 (1986). https://doi.org/10.1007/BF02198135
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DOI: https://doi.org/10.1007/BF02198135