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

Citation:  Watershed Management to Meet Water Quality Standards and Emerging TMDL (Total Maximum Daily Load) Proceedings of the Third Conference 5-9 March 2005 (Atlanta, Georgia USA) Publication Date 5 March 2005  701P0105.(doi:10.13031/2013.18091)
Authors:   S. G. Yun, J. D. Shin, J. S. Lee, J. H. Kim, W. I. Kim, and G. B. Jung
Keywords:   source, land use type, soil erosion, geomorphologic connection

Fertilizer is one of the essential agricultural materials for the food and fiber productions. However, improper management of fertilizer causes a detrimental effect on the environmental quality in the agricultural watershed. Nonpoint source (NPS) pollutants such as N and P from fertilizer applications, along with soil erosion, cause the eutrophication of water. In the slopped upland and forest areas, most of N and P are removed from soil during the heavy rainfall periods. Implementation of the best management practice (BMP) such as terrace channel and grass strip reduces the significant amounts of soil erosion to water body by preventing the vertical water flows. Paddy soil has multifunctional role in storage of water resources and purification of pollutants of various origins. N and P from nonpoint sources enter into paddy field through irrigation water and significant amounts of them can be purified by soil and rice. Agricultural practices can reveal both beneficial and detrimental effects on water quality depending on land use type. Thus, the agricultural contribution of NPS pollutants to water quality should be assessed based on the overall balanced effects. The best way for controlling the NPS is to prevent the soil and water loss from upland area. To accomplish the goals of modern agriculture, which are to produce the stable foods and to conserve the environmental quality, implementation of the BMP and development of the proper management strategies are critically needed especially in the sloped upland areas.

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