Weed & Turfgrass Science

The Korean Society of Weed Science & The Turfgrass Society of Korea Archive (한국잡초학회 & 한국잔디학회)
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Effect of Acalypha australis Occurrence on Soybean Growth and Economic Threshold Level of Acalypha australis

깨풀의 발생이 콩 생육에 미치는 영향 및 경제적 피해 한계수준

  • Yoo, Ji-Hyock (Department of Crop Life Safety, National Academy of Agricultural Science, RDA) ;
  • Moon, Byeong-Chul (Department of Crop Life Safety, National Academy of Agricultural Science, RDA) ;
  • Lee, In-Yong (Department of Crop Life Safety, National Academy of Agricultural Science, RDA) ;
  • Kim, Doo-Ho (Department of Crop Life Safety, National Academy of Agricultural Science, RDA)
  • 류지혁 (농촌진흥청 국립농업과학원 농산물안전성부) ;
  • 문병철 (농촌진흥청 국립농업과학원 농산물안전성부) ;
  • 이인용 (농촌진흥청 국립농업과학원 농산물안전성부) ;
  • 김두호 (농촌진흥청 국립농업과학원 농산물안전성부)
  • Received : 2012.09.10
  • Accepted : 2012.10.08
  • Published : 2012.12.31
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Abstract

A field experiment was conducted to investigate the effect of Acalypha australis occurrence on the growth and yield of soybean, to predict the reduction rate of soybean yield caused by competing with A. australis and to establish the economic threshold of A. australis for soybean cultivation. As the density of A. australis increase, the height and stem length of soybean were not affected by the competition with A. australis, however, the yield of soybean was decreased as 11~51% as compared with weed-free condition. The relationship between weed density and soybean yield was established as Y=415.5 / (1+0.003356X) and the reduction rate of soybean yield were predicted from this equation. Compared with the weed-free condition, the reduction rate of soybean yield were calculated as 0.3~9%, 17~29%, and 40~46% when the density of A. australis were 1~30, 60~120, and 200~250 plants $m^{-2}$, respectively. The economic threshold level of A. australis for soybean cultivation was established as 6.3 plants $m^{-2}$ from the Cousens' equation.

콩밭의 주요잡초인 깨풀의 발생이 콩 생육 및 수량에 미치는 영향을 구명하고 깨풀과의 경합에 따른 수량 감소를 예측할 수 있는 모델식을 도출하며, 잡초 정밀 관리를 위한 깨풀의 경제적 피해 한계밀도를 설정하기 위하여 본 연구를 수행하였다. 깨풀의 밀도가 높아질수록 콩의 신장은 완전방제구와 차이가 없는 반면, 경직경과 분지수는 유의적으로 감소하였으며 협수의 감소와 함께 콩 수량 감소의 요인으로 작용하여 완전방제구 대비 11~51%의 수량 감소를 보였다. 깨풀 밀도와 콩 수량과의 관계는 Y=415.5/(1+0.003356X)로 도출되었고 이 관계식으로부터 예측되는 완전방제 대비 수량 감소율은 $m^2$ 당 깨풀 1~30본 발생시 0.3~9%, 60~120본 발생시 17~29%, 200~250본 발생시는 40~46%이었으며, 깨풀의 방제가 필요한 경제적 피해 한계수준은 6.3본 $m^{-2}$로 설정되었다.

Keywords

References

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