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水稻纹枯病防治,目前尚无可以利用的抗性品种,而现行的高肥、密植栽培技术,又为本病发生提供了适宜的条件.在此情况下,施用化学的或生物的制剂,实为当前防治本病的一项有效措施.出于药剂防治的生态和经济上的考虑,作者等于1981—1983年间,通过肥料、密度和孕穗期病丛率的多级裂区试验,对小区产量和后期病情指数的主效因子作了测验,在此基础上,测定主效因子—孕穗期不同病丛率的产量损失率.三年病丛率和产量损失率的数据,按协方差计标步骤,进行直线回归分析,导出两个经验模型,再测算经济阈限,从而估计防治指标值.
Rice sheath blight disease control, there is no available varieties of resistance, and the current high-fat, close planting techniques, but also for the occurrence of the disease provided the appropriate conditions.In this case, the application of chemical or biological agents, For the current ecological control and economic considerations, the author is equal to 1981-1983, through fertilizer, density and disease rate at the bust of the multi-stage split zone test, the district Yield and late disease index were tested on the main factors, on this basis, determination of main factor - booting rate of different plexus rate of yield loss rate of three years plexus rate and yield loss data, according to the covariance meter Standard steps, linear regression analysis, derived two empirical models, and then calculate the economic threshold to estimate the value of prevention and control indicators.