Abstract
Abstract. Excessive delivery of phosphorus (P) from agricultural landscapes to surface waters results in water quality impairment. The method of application of broiler litter to agricultural fields significantly affects P loss to surface waters via surface and subsurface flow pathways from agricultural landscapes. Subsurface-band application of broiler litter can help reduce P loss in surface and subsurface flows. Typically, leachate samples are collected using lysimeters or subsurface flows are sampled to assess the effectiveness of subsurface-band application of broiler litter in limiting P mobility. In this study, we tested a simple and inexpensive method of assessing effectiveness of subsurface-band application of broiler litter using ortho-P (PO4-P) measurements in soils. This method of measuring PO4-P concentration in soils showed that subsurface-band application of broiler litter helps to reduce P leaching, whereas surface application of broiler litter was not effective in reducing P leaching. The results of this study show that soil PO4-P measurements can be successfully used to assess the effectiveness of subsurface-band application of broiler litter in reducing P leaching. Keywords: Leachate, Manure, Nutrient management, Phosphorus, Surface runoff, Water quality.
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