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长江下游地区熟制问题的争论由来已久,众说纷云。我们认为:问题的症结不在于这个地区能否种三熟制,而是如何因地制宜地合理调整熟制的比例,达到增产增收。现从气候资源、生产条件和经济效益等几方面试析如下。一、气候资源长江下游属亚热带北缘,年平均温度15～16℃。从温度来看,一年种二熟很宽裕,种三熟很勉强(丁昌令,本刊1980.1),属双季稻过渡带。这里,早稻育秧期间经常遇到低温而引起烂秧,而后季稻抽穗开花期又很易碰到寒露风低温危害,造成翘穗头。1980年江苏省900万亩后季稻,有327万亩没有
The controversy over ripening in the lower reaches of the Yangtze River has a long history of controversy. We think: The crux of the problem lies not in whether the region can plan for three-cropping but how to rationally adjust the proportion of cooked-up areas in order to increase production and income. Now from the climate resources, production conditions and economic benefits and other aspects of the following analysis. First, the climate resources The lower reaches of the Yangtze River is a subtropical north edge, the annual average temperature of 15 ~ 16 ℃. From the temperature point of view, one year two very familiar, three kinds of very reluctantly (Ding Changling, article 1980.1), is a double crop transitional zone. Here, low temperature is often encountered during early rice growing seedlings caused by rotten seedlings, and then flowering and flowering season is easy to come across cold dew cold wind damage, resulting in Alice head. Nine million mu of post-season rice in Jiangsu Province in 1980, there are 327 mu did not