마령지구 필지 논으로부터 영농기 영양물질 수지와 유출부하량

Nutrient Balance and Runoff Loading During Cropping Period from a Paddy Plot in Maryeong Irrigation District

  • 최진규 (전북대학교 농과대학 농공학과(농업기술연구소)) ;
  • 구자웅 (전북대학교 농과대학 농공학과(농업기술연구소)) ;
  • 손재권 (전북대학교 농과대학 농공학과(농업기술연구소)) ;
  • 윤광식 (전남대학교 농과대학 생물산업공학과(농업과학기술연구소)) ;
  • 조재영 (전북대학교 농과대학 농화학과)
  • 발행 : 2001.09.01

초록

A study was carried out to investigate the water balance and losses of nutrients at a paddy plot located at the southern Korea. The observed amount of precipitation, irrigation, runoff, evapotranspiration and percolation for the experimental paddy plot during cropping period were 1,030, 566, 701, 551. and 310 mm for 1999 and 1.214, 413, 710, 682, and 234 mm for 2000 year, respectively. The measured input quantities of N and P into the paddy field during cropping period were 122 to 140 kg N $ha^-1$ and 29 to 30 kg $P_2O_5$ kg $ha^-1$ by chemical fertilizer, 20 to 28 kg N $ha^-1$ and 0.35 to 0.36 kg P $ha^-1$ by precipitation, and 26 to 35 kg N $ha^-1$ and 0.57 to 0.72 kg P$ha^-1$ by irrigation water. respectively. The output amounts of N and P from paddy field were measured as follows. They were 48 to 52 kg N $ha^-1$ and 1.1 to 1.6 kg P $ha^-1$by runoff water, and 9 to 12 kg N $ha^-1$ and 0.04 to 0.05 kg $ha^-1$ by percolation water. When the runoff losses of nutrients were compared to applied chemical fertilizer. it was found that 34.3 % to 42.6 % of nitrogen lost via runoff while runoff losses of phosphorus account for 3.8 % to 5.3 % of the total applied amount. When the ratio was calculated between nutrients losses by percolation water and the applied of chemical fertilizer, two year results showed 6.4 % to 9.8 % for the nitrogen and 0.1% to 0.2% phosphorus, respectively.

키워드

참고문헌

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