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Field experiments were conducted to investigate the competition relationships of main paddy weeds with transplanted rice grown in paddy conditions. Data were used to predict crop yield as a function of weed density using a rectangular hyperbola model and determine weed economic threshold (ET) levels. The rectangular hyperbola (equation 2) was fitted to rice yield to estimate weed-free rice yield (Yo) and weed competitivity (β). Its competitivity for M. vaginalis was 0.0007445, 0.0005713, 0.000988 and 0.0008846 in Daejeon, Suwon, Iksan and Naju, respectively. The competitivity at harvest represented by parameter β ranged from 0.001611 in Naju to 0.002437 in Iksan for S. trifolia. The ET levels of main paddy weeds in machine transplanted rice cultivation were well estimated based on the herbicides applied and its application cost. Therefore, our results can be used to support decision-making on herbicide application for weed management in transplanted rice cultivation.


본 연구는 벼에 대한 물달개비, 벗풀의 경합에 따른수량피해 예측과 경제적인 잡초관리를 위한 방제필요밀도를 구명하고자 하였다. 수원, 익산, 나주와 대전지역에서 얻어진 성적을 종합한 예측모델식에 따르면논에서 물달개비의 경합력은 대전 0.0007445, 수원0.0005713, 익산 0.000988, 나주에서 0.0008846으로추정되었다. 벗풀의 경합력은 나주 0.001611에서 익산에서 0.002437의 범위를 보였다. 초종별 평방미터당요방제 필요밀도는 물달개비는 중기제초제 처리시 22에서 39본으로, 벗풀은 8.8본에서 12.9본으로 추정되었다.