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Generation and Discharge Characteristics of Non-point Pollutants from Farmlands of Small Watershed for Nak-dong River  

Jung, Yong-Jun (Department of Environmental Engineering, Kyungpook National University)
Nam, Kwang-Hyun (Daegu-Gyeongbuk Development Institute)
Min, Kyung-Sok (Department of Environmental Engineering, Kyungpook National University)
Publication Information
Journal of Korean Society on Water Environment / v.20, no.4, 2004 , pp. 333-338 More about this Journal
Abstract
This study was carried out to investigate the generation and discharge characteristics of non-point pollutants from farmlands in Nak-dong river basin. Annual unit generation load of nitrogen and phosphorus by fertilization in the test paddy field was almost similar to those calculated by the fertilization standards of district agricultural technology center, but it was extremely higher in case of the test dry field. By comparing annual total generation load of nutrients from fertilization to the data of fertilizer marketing, the accurate forecasting of generation load of pollutants was achieved by marketing data. The annual total discharge ratio of nutrients through infiltration and overflow from the farmland of the test paddy field were 9.5% and 1.1%, respectively, and those in the test dry field were 22.0% and 0.1%, respectively. The monthly discharge load of nutrients were shown the highest proportioned to the discharge load from lands, but it showed higher in phosphorus, which was caused by the intermittent discharge of phosphorus accumulated in drainage.
Keywords
Generation and discharge load; Non-point pollutants; Farmland;
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