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Nitrogen and Phosphorus Losses in Surface Runoff Water from Various Cash Cropping Systems

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  9th International Drainage Symposium held jointly with CIGR and CSBE/SCGAB Proceedings, 13-16 June 2010  IDS-CSBE-100082.(doi:10.13031/2013.32114)
Authors:   Pingjin Jiao, Tiequan Zhang, Xu Di, Shaoli Wang
Keywords:   Natural rainfall, Cash crop, Water quality, Surface runoff, Nitrogen, Phosphorus

Nitrogen (N) and phosphorus (P) losses from agricultural soils have been identified as a major contributor to declining surface water quality. Field experiments were conducted to evaluate the effects of cash crops on surface runoff N and P concentrations and loadings in the north part of Huaihe River Basin, China. The treatments comprised three cropping systems including soybean, cotton, and corn, with a bare plot as control. Runoff volume, sediment yield, runoff N and P loadings were significantly affected by the cash cropping system, in the order of bare plot> corn plot> cotton plot> soybean plot. The variation of runoff and sediment yield from different cash cropping systems correlated to the Leaf Area Index (LAI). The factors affecting the loadings of N and P were also closely related to LAI and surface runoff volume. Dissolved N and dissolved P were the main forms of N and P losses for cotton and soybean plots, whereas the particulate N and dissolved P were the main forms of N and P losses for corn plot. Soybean and cotton production can be the cropping systems that reduce the N and P surface losses during the peak-flow production period, if economically feasible.

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