作物产量的形成与其一生中各个发育期的气候条件密切相关,因此可根据这种关系在作物不同的发育时段作出产量预报。我们试用凤山县历年的中稻产量与气象条件的联系,分别在几个主要发育期作出产量趋势预测,并随着时间的推移做出修正补充,逐步使最终预报结论向实际产量逼近。此方法简单易行,且有一定效果。 中稻是凤山县种植面积较广的粮食作物品种,一般在5月下旬播种,10月份成熟收获。经气候分析和社会调查可知,我县中稻生产时期的热量条件是优越的,基本上不存在冷害问题。主要的问题则是秋旱,在九月份当地气温仍较高,雨水偏少,田间水份往往欠缺。而此时期正是中稻的幼穗分化和抽 The formation of crop yield is closely related to the climatic conditions at various developmental stages of its life, so that yield forecasts can be made at different developmental stages of the crop based on this relationship. We try to find out the relationship between the yield and the meteorological conditions of middle-grade rice in Fengshan County over the years. We forecast the production trends in several major developmental stages and make corrections and supplements with the passage of time so as to gradually bring the final forecast conclusion to the actual output. This method is simple and has some effect. Medium-sized grains are widely planted in Fengshan County. They are generally sown in late May and harvested in October. According to the climatic analysis and social survey, we can see that the heat condition during the production of middle-grade rice in our county is superior, and there is basically no problem of chilling damage. The main problem is the autumn drought. In September, the local temperature was still high, with less rain and less water in the field. This period is exactly the panicle differentiation and pumping of middle rice