早稻,是我区粮食生产中比较稳产高产的一季。但在年度之间由于气候条件的影响,仍会出现一定的起伏,有时产量上落也会比较大。究其原因,7月上中旬的高温是一个重要因素。高温天气会导致早稻空瘪率增高,千粒重降低,产量下降。例如1977年7月上、中旬的持续高温,使在这期间抽穗灌浆的早稻瘪谷率比正常年分高10％,千粒重降低2克,产量减少10％以上。因此,调查 Early rice is a stable and high-yielding season in grain production in our region. However, due to the climatic conditions in the year between, there will still be some ups and downs, and sometimes the output will be relatively large. The reason, high temperature in mid-July is an important factor. Hot weather will lead to an increase in early rice empty flat rate, reduced grain weight, yield decline. For example, the continuous high and medium temperatures in July and mid-July 1977 led to a 10% increase in the rate of defoliation of early rice in heading and filling during this period, a decrease of 2g in 1000-grain weight and a decrease of more than 10% in output. Therefore, the survey