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Assessment of Nitrogen Impaction on Watershed by Rice Cultivation
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 Title & Authors
Assessment of Nitrogen Impaction on Watershed by Rice Cultivation
Roh, Kee-An; Kim, Min-Kyeong; Lee, Byeong-Mo; Lee, Nam-Jong; Seo, Myung-Chul; Koh, Mun-Hwan;
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 Abstract
It is important to understand and evaluate the environmental impacts of rice cultivation for developing environmentally-friendly agriculture because rice is main crop in Korea and rice cultivation have both functions of water pollution and purification with environmental and cultivation conditions. This paper presents the evaluation of nitrogen impact by rice cultivation on water system. A simple protocol was proposed to assess the potential amount of nitrogen outflow from paddy field and most of parameters affect on the nitrogen outflow from paddy field such as the amount of fertilizer application, water balance, the quality and quantity of irrigation water, soil properties, nitrogen turnover in the soil and cultivation method were considered. To develop the protocol, coefficients for parameters affected nitrogen turnover and outflow were gotten and summarized by comparison and analysis of all possible references related, and by additional experiments at field and laboratory. And potential amount of nitrogen input and output by water in paddy field were estimated with the protocol at the conditions of the nitrogen contents of irrigation water, amount of fertilizer application, and irrigation methods. Where irrigation water was clean, below 1.0 mg of nitrogen concentration, rice cultivation polluted nearby watershed. At the conditions of 2.0 mg of nitrogen concentration, 110 kg of nitrogen fertilizer application and flooding irrigation, rice cultivation had water pollution function, but it had water purification function with intermittent irrigation. At the conditions of 3.0 mg of nitrogen concentration and 110 kg of nitrogen fertilizer application, rice cultivation had water purification function, but that had water pollution function with 120 kg of nitrogen application. Where irrigation water was polluted over 6.0 mg of nitrogen, it was evaluated that rice cultivation had water purifying effect, even though the amount of nitrogen application was 120 kg .
 Keywords
Environmental impact;Rice paddy;Nitrogen;Irrigation;Water pollution;Nutrients input;Nutrients output;
 Language
Korean
 Cited by
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강우시 비점오염물질의 유출특성에 관한 연구 -곡성천 상.하류를 대상으로-,양해근;

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질소수지에 의한 환경특성과 영농방법별 벼농사의 수질영향 평가,노기안;김민경;고병구;김건엽;심교문;이덕배;

한국토양비료학회지, 2009. vol.42. 6, pp.439-446
4.
2008년도 대한민국 질소수지 연구: 비점오염증가 및 $N_2O$발생량산정,남역현;안상우;박재우;

대한환경공학회지, 2011. vol.33. 2, pp.103-112 crossref(new window)
1.
Input and Output Budgets for Nitrogen of Paddy Field in South Korea, Korean Journal of Soil Science and Fertilizer, 2016, 49, 1, 60  crossref(new windwow)
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