【摘要】 通过人工接种试验证明,在品种和小种组合一定时,大豆灰斑病的潜育期主要是由温度决定的,利用有效积温可以预测潜育期的动态变化。本文供试3个品种的日显证率与有效积温的关系可以用Gompertz模型描述,并获得了3个品种的显症率预测式。更多还原

【Abstract】 According to the inoculative experiments in green house,the results showed that the latent period of soybean frogeye leaf spot was determined by the effective accumulative temperature for certain cultivars. The dynamic variation of daily rate of lesion appearance can be forecasted by the effective accumulative temperature. The paper showed that the relationship between the accumulative daily rate of lesion appearance and effective accumulative temperature of 3 cultivars might be described Gompertz model. The model of 3 cultivars are:Hongfeng 3 pp = 104. 2276exp[-29. 9088exp( -0. 06625TT)] r = 0. 9094 Hefeng 25 pp = 106. 1627exp[-33. 6979exp(-0. 06329TT)] r = 0. 9659 Suinong 8 pp = 107. 2370exp[-24. 0048exp(-0. 05851TT)] r = 0. 9439 respectively, in which pp is accumulative rate of symptom appearance ,TT is effective accumulative temperature.更多还原