| Using gypsum to reduce phosphorus in runoff from subcatchments in South Australia (2005) | |||||||||||||
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| Copyright © 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America. Received for publication January 15, 2005. Concentrations of phosphorus (P) in runoff from agricultural catchments in southern Australia are high and well above national and international limits. Phosphorus was found to exit two subcatchments of 3.6 and 4.2 ha in the Adelaide hills via both overland flow and interflow. The subcatchments had texture-contrast soils with high inputs of superphosphate and were openly grazed by cattle all year. Interflow at the boundary of the B and C soil horizons accounted for as much as half the total water flow that was measured (overland flow, A–B interflow, and B–C interflow). The average flow-weighted concentration of total P within overland flow was as high as 0.25 mg L–1, and 0.05 mg L–1 in B–C interflow. In most years P loss was in the dissolved (. J. W. Cox, J. Varcoe, D. J. Chittleborough and J. van Leeuwen | |||||||||||||
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