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期 刊 ：植物保护学报 1996年

关键词：水稻纹枯病；损失估计；

Keywords:rice sheath blight, loss assessment,

摘 要 ：作者研究了中稻纹枯病所致的产量损失,结果表明:瘪谷、不实率增多及实粒的千粒重下降是水稻纹枯病影响稻谷减收的主要因素,它们与病情的关系呈幂函数曲线。纹枯病的为害除影响稻谷减收外,还导致出米率下降和碎米率增高。纹枯病的为害以黄熟初期的病情指数与稻谷减收率的关系最密切,根据试验数据经多种曲线拟合,比较其拟合度,以韦布尔模型最优,其稻谷减收率的函数式为: Y=1-exp[-((X-0.03840)/(1.47235))~(1.7005)] 式中Y为稻谷减收率,X为黄熟期病情指数。

Abstract:A study on yield loss caused by sheath blight of medium rice was carried out continuously in 1985 - 1987. The results showed that main factors of the yield reduction caused by sheath blight were related to the increasing of shrunken grains and non-solid g

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