Journal of The Korean Society of Grassland and Forage Science (한국초지조사료학회지)

The Korean Society of Grassland and Forage Science (한국초지조사료학회)
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Effect of Increased Slope on Corn Productivity and Nitrogen Losses in Runoff Water

경사도 증가가 옥수수의 생산성 및 유거수 중의 N의 유실에 미치는 영향

  • Jung, Min-Woong (National Livestock Research Institute, Rural Development Administration) ;
  • Yook, Wan-Bang (Department of Animal Sciences Environment, College of Animal Husbandry, Kon-Kuk University) ;
  • Choi, Ki-Choon (National Livestock Research Institute, Rural Development Administration)
  • 정민웅 (농촌진흥청 국립축산과학원) ;
  • 육완방 (건국대학교 동물생명과학대학) ;
  • 최기춘 (농촌진흥청 국립축산과학원)
  • Received : 2011.03.14
  • Accepted : 2011.06.24
  • Published : 2011.06.30
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Abstract

본 연구는 우분액비의 시용이 경사도를 달리한 사료용 옥수수 재배지에서 옥수수의 생산성 및 유거수 중의 N의 유실에 미치는 영향을 조사하기 위하여, 건국대학교 축산대학 사료작물 시험포 내 설치된 Erosion apparatuses (가로 0.33 m, 세로 3 m, 깊이 0.4 m)를 이용하여 수행하였다. 시험구의 경사도는 0%, 8.75%, 17.50%로 하였으며, 우분액비는 6개월 이상 부숙된 것으로 질소 기준 200 kg/ha 시용하였다. 옥수수의 건물생산성과 사료가치는 경사도에 의해 영향을 받았으며, 17.50% 경사지의 건물생산성은 0% 경사지의 건물생산성에 비해 유의적인 감소를 보였다 (P<0.05). 유거수 중의 평균 $NO_3^--N$과 $NH_4^+-N$의 농도는 경사가 높아질수록 유의적으로 증가하였다(P<0.05). 이상의 결과에서 보는 바와 같이 우분액비를 시용하여 사료용 옥수수를 재배할 경우, 경사도가 증가할수록 그리고 집중호우가 발생할 경우에 유거수 중의 양분 유실량은 증가가 예상되기 때문에 경사도가 심한 지역에서 옥수수를 재배할 때에는 양분유실에 따른 수질오염을 고려하여 사료작물 재배 방법이 모색되어야 한다.

Keywords

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