【摘要】 本文以油菜菌核病为分析对象来研讨作物病害的损失率估算方法,得出当病害发病程度和损失呈直线关系时,损失率一般方程式可表示为Y=(a×发病率+b×K×病情指数)/100,2012年经对36块油菜田菌核病损失率进行估算,并与观测值进行卡平方检验,结果理论值与实测值差异极小,表明此方程可靠性高,可用于病害损失率的准确估算。更多还原

【Abstract】 Taking rape Sclerotinia rot as an object,the author described an estimation method for loss rate caused by crop diseases.When there is a linear relationship between the occurrence degree and the loss rate,the equation of loss rate could be shown as:Y=(aX1+b K X2)/100,X1was the disease incidence,X2was the disease index. In 2012,loss rate caused by Sclerotinia rot in 36 rape fields was evaluated with the equation.Chi-square test showed that little difference was found between the theoretical value and the survey value,indicating that the equation could be applied to estimate the loss rate caused by crop diseases.更多还原