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水稻纹枯病的流行程度受气候因子温湿度的制约,本文选出影响早稻纹枯病流行的5个温湿度因子:上年10～12月平均气温(x_1)、当年5月下旬平均气温(x_2)、当年3～5月平均相对湿度(x_3)、当年6月平均气温(x_4)和当年6月平均相对湿度(x_5),用模糊数学求综合隶属度法,作为早稻纹枯病流行温湿度的综合指标,能反映温湿度对本病流行程度的影响,拟合率达90%。如用3个因子 x_1、x_2、x_3对早稻纹枯病进行预测,回测结果与实测
The prevalence of rice sheath blight was restricted by the temperature and humidity of climatic factors. Five temperature and humidity factors that affected the prevalence of early rice sheath blight were selected in this paper: the average temperature in October ~ December of last year (x_1), the average temperature in late May of that year x 2), the mean relative humidity (x_3) from March to May of that year, the average temperature in June of that year (x_4), and the average relative humidity (x_5) in June of that year, and the comprehensive membership degree method by fuzzy mathematics. The comprehensive index of humidity can reflect the influence of temperature and humidity on the epidemic degree of this disease, and the fitting rate is up to 90%. For example, three factors x_1, x_2 and x_3 were used to predict rice sheath blight. The backtesting results and the measured