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Evaluation of Phosphorus Balance in Green Manure-Rice Cropping Systems with Different Incorporation Rate of Green Manure Crops

녹비작물 환원에 따른 벼 재배지 인산수지 평가

  • Kim, TaeYoung (Division of Applied Life Science, Gyeonsang National University) ;
  • Daquiado, Aileen Rose (Division of Applied Life Science, Gyeonsang National University) ;
  • Alam, Faridul (Division of Applied Life Science, Gyeonsang National University) ;
  • Kim, Pil-Joo (Division of Applied Life Science, Gyeonsang National University) ;
  • Lee, YongBok (Division of Applied Life Science, Gyeonsang National University)
  • 김태영 (경상대학교 응용생명과학부) ;
  • 아일린 (경상대학교 응용생명과학부) ;
  • 파리둘 (경상대학교 응용생명과학부) ;
  • 김필주 (경상대학교 응용생명과학부) ;
  • 이용복 (경상대학교 응용생명과학부)
  • Received : 2012.12.03
  • Accepted : 2012.12.18
  • Published : 2012.12.31

Abstract

BACKGROUND: In Korea, green manure has been cultivated for reducing chemical fertilizer application, maintaining soil fertility, and feeding livestock in winter season. We evaluated the phosphate balance under green manure-rice cultivating system with different removal rates of green manure for maintaining soil fertility. METHODS AND RESULTS: The barley and hairy vetch mixture was selected as the green manure in this study. The barley and hairy vetch was sowed at a rate of 135 and 23 kg/ha, respectively, without fertilizer application. Total aboveground biomass was 12000 (barley: 5400 kg/ha, hairy vetch: 6600 kg/ha) kg/ha, and these green manure were incorporated with different input rates before rice planting. The input rates of green manure in this study were 0 (NPK+0%), 25 (NPK+25%), 50 (NPK+50%), 75 (NPK+75%) and 100 % (NPK+100) and the standard fertilization (NPK) without green manure cultivation. All treatments were applied with standard fertilizer (N-P-K: 90-19.6-48.3 kg/ha) before rice planting. The highest rice yield was observed in NPK+50% which was 20% higher compared with NPK. The phosphate balance with different incorporation rates of green manure was-104.0,-76.8,-52.9,-27.4, and 6.0 kg/ha for NPK+0%, NPK+25%, NPK+50%, NPK+75%, and NPK+100%, respectively. CONCLUSION(S): The use of green manure for livestock feeding in green manure-rice cropping systems could remove a huge amount of phosphate. This cropping system strongly requires phosphate application before green manure seeding for maintaining soil fertility.

Keywords

Green manure;Phosphate balance;Rice

Acknowledgement

Supported by : Rural Development Administration

References

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