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为探寻稻曲病发病程度与水稻产量损失的关系,选择粳、糯、杂交籼稻的4个品种,采用随机区组设计,适度调控病情梯度,按单穗病粒数分级,大样本取样考种的方法,建立了不同水稻类型的稻曲病产量损失模型。结果表明,稻曲病发病程度与稻谷损失率和精米下降率呈正相关且关系密切。经多种数学模型比较,Weibull模型拟合度最好。建立的稻谷减收率模型为:Y1(粳糯稻)=1-exp(-(X+0.999 99)/16.091 6)^1.180 8),R2=0.990 4;Y2(中籼稻)=1-exp(-(X-0.699 99)/24.818 8)^0.8542),R2=0.983 5。精米下降率模型为:Y3(粳糯稻)=1-exp(-(X+0.599 99)/83.499 7)^1.139 6),R2=0.965 5;Y4(中籼稻)=1-exp(-(X-0.499 99)/68.542 9)^1.456 0),R2=0.967 9。
In order to explore the relationship between the incidence of rice smut and the rice yield loss, four varieties of japonica, waxy and indica hybrid rice were selected. Randomized block design was adopted to moderately control the disease gradient. The model of the yield loss of different rice types was established. The results showed that the incidence of false smut had a close relationship with the loss rate of rice and the rate of decline of polished rice. Weibull model has the best fitting degree by many kinds of mathematical models. The model of rice yield reduction was established as follows: Y1 (japonica glutinous rice) = 1-exp (- (X + 0.999 99) /16.091 6) ^ 1.180 8), R2 = 0.990 4; - (X-0.699 99) /24.818 8) ^ 0.8542), R2 = 0.983 5. The decreasing rate model of rice was as follows: Y3 (japonica glutinous rice) = 1-exp (- (X + 0.599 99) /83.499 7) ^ 1.139 6), R2 = 0.965 5; -0.499 99) /68.542 9) ^ 1.456 0), R2 = 0.967 9.