本文根据杭州地区一九五一至一九七二年的温度资料,初步分析杭州地区连作晚稻生育后期的主要低温情况,并提出防御意见。一、连作晚稻花粉母细胞减数分裂期的低温水稻在花粉母细胞减数分裂时期,如遇到日平均气温小于20℃的低温,就会产生大量秕谷。根据生产实践经验,杭州地区连作晚稻的花粉母细胞减数分裂期约在九月中旬。造成九 Based on the temperature data from 1951 to 1972 in Hangzhou area, the paper mainly analyzes the main low temperature during late growth stage of continuous cropping in Hangzhou and puts forward defensive suggestions. First, even for late rice pollen mother cell meiosis of low-temperature rice pollen mother cell during meiosis, in case of daily average temperature is less than 20 ℃ low temperature, will produce a large number of barley. According to production practice, the pollen mother cell meiosis period in continuous cropping in Hangzhou is about mid-September. Caused nine