摘要:
以前一周阴晴、雨晴、叶温和蕹菜白锈病情不变因子,进行周Fuzzy聚类预测,测得了1984～1989年各发病周类别与实测病情级别拟合率达88.6%。以农药甲霜灵品质直线Yi′(P<0.05)和甲霜灵蕹菜产量Yi″(P<0.05)直线,组建甲霜灵双剂型蕹菜产值曲线为目标函数,在各剂型用量、使用面积,成本利率和蕹菜品质约束下,可求出单纯形法的双剂型甲霜灵最优量。
Abstract:
Fuzzy saaemble analysis was used to separate and classify 3 kinds of the symptom-varies in white rust of dwamp morningglory which comes from last every week of infect period in 1984/1989. The results show that the method can be used to classify symptom-varies according to 4 kinds of the similarities in last every week, including temperature on leafage, rainfall, disease index, and cloudy days ect. and its conicidental ratio with actual disease index on this week is 88.6%.The paper also deals with the option on the optimum rate of fungicides under constraint condition, with the equation constraint a general principle of alternative optimum rate of fungicides is derived, whereas under unequal constraint condition a nonlinear programming is tried so as to find out the optimum solution. With regard to the quadratic function of metalaxyl application a method of calculation on optimum solution is also given.
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