Abstract
Abstract The residual effect of Cu fertilization is not well quantified. The change in extractable soil Cu with time after a single fertilization was determined in five soils (four Ultisols and one Inceptisol) with humic matter (HM) content ranging from 3.8 to 21.4 g/L. Rates of Cu to 4.48 kg/ha were broadcast in solution and incorporated to 20 cm on each soil. The soils were sampled for six years after application and extracted with Mehlich‐3 solution. The data were fitted to a model based on the fraction of fertilizer Cu predicted to be extractable immediately after application and an exponential decrease in extractable Cu with time. Considerable variation in extractable Cu concentration was found, both among soils and among years within a soil. The model predicted that 47% to 74% of the applied Cu could be extracted from the soil immediately after fertilization. Extractable Cu decreased exponentially with time, but at a very slow rate. Neither the percentage found immediately after fertilization nor th...
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