콩씨스트선충(Heterodera glycines)의 밀도가 콩 수량에 미치는 영향
Effect of the Density of Heterodera glycines on Soybean Yield
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초록
본 연구는 토양 내 콩씨스트선충(Heterodera glycines)의 초기 밀도에 따른 콩의 수량구성요소 및 수량에 미치는 영향을 규명하기 위하여 실시하였다. 재배포를 35개의 구역을 나누고 콩씨스트선충의 파종 전 토양 내 씨스트 밀도와 알 밀도를 조사하였으며, 수확기 콩의 초장, 협수, 립수, 백립중을 비교 분석하였다. 초기 씨스트의 밀도보다 씨스트 내 알의 밀도가 수량에 더욱큰 영향을 미쳤으며, 초기 알 밀도가 높을수록협수와 수량이 초기 알 밀도가 높을수록 감소하는 경향을 보였고 토양 100 ㎤ 당알의 밀도가 2,000개 이상일 때부터 수량이 20% 이상 급격하게감소하였다. 본 연구결과를 통하여 콩 재배 시 콩씨스트선충에의한 피해를 예측할 수 있으며, 국내 콩 재배지의 약 40%가 감염되어 있는 콩씨스트선충에 대한 저항성 품종 육성을 포함한 다양한 방제방법 연구가 필요하다.
Abstract
This study was conducted to investigate the yield loss of soybean by initial density of Heterodera glycines in soil. A soybean cultivar named ‘Cheongja5ho’ was cultivated as test material in Dangjin city, Chungcheongnam-do, Korea. Each seed was planted with distance of 25 cm in 35 plots by initial density of egg of the cyst nematode on June 21st, and allowed to harvest on November 12st in 2019. As a results, the yield of soybean decreased sharply when as the initial density of eggs of cyst nematode increased. The initial density of eggs in soil affected largely on the decreased yields of the soybean by more than 20% in above 2,000 eggs, and 30% in above 6,000 eggs of the cyst. Beyond the 6,000 eggs, the yield loss was more slowly decreased compared with the above cases. Eggs of H. glycines are widely distributed in Korea, resulting in the serious soybean yield loss by H. glycines.
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