Korean Journal of Organic Agriculture (한국유기농업학회지)

Korean Association of Organic Agriculture (한국유기농업학회)
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Effects of Green Manures and Complemental Fertilization on Growth and Nitrogen Use Efficiency of Chinese Cabbages Cultivated in Organic Systems

녹비작물과 추비방법이 유기재배 배추의 생육과 질소 이용효율에 미치는 영향

  • 조정래 (국립농업과학원 유기농업과) ;
  • 안난희 (국립농업과학원 유기농업과) ;
  • 남홍식 (국립농업과학원 유기농업과) ;
  • 이상민 (국립농업과학원 유기농업과)
  • Received : 2018.10.11
  • Accepted : 2018.11.19
  • Published : 2018.11.30
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Abstract

This study was conducted to evaluate the effects of green manures and complemental fertilization with oil cake or liquid fertilizer on growth and nitrogen use efficiency of Chinese cabbage cultivated in organi systems. Field experiments were carried out at the National Institute of Agricultural Science in Suwon, South Korea from 2012 to 2014. Two green manure crops, Crotalaria and Hairy vetch, was cultivated in summer and in winter, respectively. The application methods of the green manure consisted of three tillage systems (overall tillage, partial tillage and no tillage). Oil cake and liquid fertilizer were used as complemental fertilizer. The results showed that when used as covering material in the upland soil without tillage, green manure fertilization was more effective in increasing growth and yield of Chinese cabbage than when incorporated into soil. It was possible to grow and harvest Chinese cabbage in the spring season by the application of hairy vetch as winter green manure. The higher yield of Chinese cabbage with green manure application was caused by the lower incidence rate of soft rot and tip-burn. The yield of the Chines cabbage that received green manure applications over two consecutive seasons followed by the supplemental fertilization with oil cake was similar to that of the conventional chemical fertilization. Following a single season green manure application in summer, however, the yield of cabbage was only about 70% of the conventional treatment. Green manure cultivation with additional liquid fertilization produced a yield similar to the conventional fertilization treatment, soil inorganic nitrogen concentration remained stable and the nitrogen use efficiency increased in the green manure applied soil. In conclusion, the organic cultivation of Chinese cabbage in the autumn season could be outperformed in the upland soil receiving two seasons (winter and summer) of green manure fertilization followed by the supplemental fertilization with liquid fertilizer.

배추 유기재배 시 녹비작물과 추비방법이 배추의 생육과 질소이용에 미치는 영향을 구명하기 위하여 2012년부터 2014년까지 수원에 있는 국립농업과학원 포장에서 시험을 수행하였다. 녹비작물은 여름철 크로타라리아와 겨울철 헤어리베치를 이용하였다. 녹비처리 방법은 전면경운 토양혼입방법과 부분경운 토양혼입방법, 그리고 무경운 예취피복처리를 비교하였다. 추비방법은 녹비만 처리한 것과 녹비 처리 후 유박과 액비로 추비한 처리를 비교 하였다. 시험결과 녹비 처리 방법은 예취 후에 경운하여 토양혼입 하는 것보다 무경운 피복처리 하는 것이 좋았다. 봄배추재배 시 동계 녹비작물 헤어리베치 재배로 정상적인 생육과 수량이 가능하였고 관행의 화학비료 처리구에 비하여 무름병과 Tip-burn 발생이 적어 수량성도 높았다. 가을재배에서는 녹비 연속재배와 유박 추비로 관행의 화학비료처리구와 비슷한 수량을 보였다. 하지만 하계 단기성 녹비작물 재배 시에는 관행 수량의 70% 내외에 그쳤다. 녹비재배에 이은 액비 활용 양분관리로 관행과 비슷한 수량이 가능하였고 토양중 무기태 질소가 안정적으로 유지되고 질소이용효율도 향상되었다. 결론적으로 배추 유기재배를 위해서는 겨울과 여름 녹비작물을 재배하고 가을 작기를 선택하여 액비로 추비하는 것이 권장된다.

Keywords

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