Korean Journal of Organic Agriculture (한국유기농업학회지)

Korean Association of Organic Agriculture (한국유기농업학회)
권호 표지

Incorporation of Winter Rapeseed (Brassica napus) as Green Manure on Mineralization and Uptake of Nitrogen to Succeeding Corn (Zea mays L.)

유채의 녹비 환원에 의한 질소무기화 및 옥수수의 질소 흡수

  • 최봉수 (강원대학교 자원생물환경학과) ;
  • 홍기찬 (강원대학교 자원생물환경학과) ;
  • 성좌경 (국립농업과학원) ;
  • 남재작 (국립농업과학원) ;
  • 임정은 (강원대학교 자원생물환경학과) ;
  • 이현용 (강원대학교 자원생물환경학과) ;
  • 양재의 (강원대학교 자원생물환경학과) ;
  • 옥용식 (강원대학교 자원생물환경학과)
  • Published : 2009.09.30
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Abstract

Crop production can be secured by the cycle of green manure crops as an alternative of the chemical fertilizer. Recently, rapeseed (Brassica napus L.) has been cultivated in the south part of Korea for the production of biodiesel. In this research, we focused on recycling rapeseed residue, which is produced after harvesting the rapeseed for biodiesel, as a potential source of nitrogen to the succeeding crop. Pot experiment was conducted to evaluate the effects of winter rapeseed as green manure on mineralization and uptake of nitrogen to the succeeding corn (Zea mays L.). Result showed that total nitrogen and C/N ratio of rapeseed at the harvesting stage was 0.54% and 63, respectively. The incorporation of rapeseed without decomposition period slightly inhibited nitrogen uptake to the succeeding corn compared to those with 30 days decomposition period. The pH and EC values of soils increased by increasing the period of decomposition of rapeseed from 5.2 to 6.4 and from 0.05 dS/m to 0.21 dS/m, respectively. Significant amounts of $NH_4^+$ and $NO_3^-$ are released by incorporation of rapeseed. The succeeding corn took up 86% and 88% of inorganic nitrogen released from the rapeseed with and without decomposition period, respectively. The overall results suggested that the utilization of rapeseed residue as green manure can be an alternative source of nitrogen in corn-rapeseed double cropping system.

녹비 작물의 이용은 화학비료의 사용을 대체하고 물질순환에 의한 안전한 농작물 생산을 가능하게 할 수 있다. 이에 본 연구는 바이오디젤 생산의 원료로 이용되는 유채 종자의 유채의 녹비 환원에 의한 질소무기화 및 옥수수의 질소 흡수 389 수확 후 잔유물의 녹비 이용 가능성을 평가하였다. 유채 수확 후 잔류물의 질소함량은 0.53%로 낮았으며 탄질율은 63으로 나타났다. 유채 잔유물의 부숙기간 없이 환원 직후 파종한 처리구는 옥수수의 질소 흡수를 지연시켰으며, 생육에서도 30일간 부숙기간을 설정한 처리구의 옥수수보다 억제되어 유채 잔유물의 녹비 환원 직후 후작물의 파종은 주의해야 할 것으로 판단되었다. 유채 잔유물의 녹비 환원 90일 후 질소무기화는 암모늄태 질소(24.2mg/kg)보다 질산태 질소(58.4mg/kg)에서 높았으며, 방출된 무기태 질소에 대한 옥수수의 흡수 및 이용량은 부숙기간 없이 환원 직후 파종한 처리구와 30일간 부숙기간을 설정한 처리구에서 각각 86%와 88%로 나타났다.

Keywords

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