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一、早发是棉花高产的基础“早发花看产量,晚发花看卖相”,这是郊区贫下中农对棉花高产规律的概括,说明了棉花早发的重要性。早发花为什么能够高产?主要是由于它符合棉花高产的内在规律,充分利用了上海地区的自然资源。大家知道,棉铃的生长发育,需有一定的肥、水、光、温等条件,而棉纤维是由单糖在温度较高的情况下转化而成的.如果温度下降到15.6℃,棉纤维就不能形成。因此,在水肥条件基本满足时,温度就成为主要的因素。据我院在华漕地区观察:开花到吐絮需1400℃左右的积温,随着气温的下降所需积温逐渐增加,在干旱和早霜来临
First, early hair is the basis for high-yielding cotton, “early flowering to see yield, late bloom to sell” This is a suburban poor middle peasants outlined the law of high-yielding cotton, cotton shows the importance of early onset. Why early flowering can be high yield? Mainly because it conforms to the inherent law of cotton yield, make full use of the natural resources in Shanghai. As we all know, cotton boll growth and development, need to have some fertilizer, water, light, temperature and other conditions, and cotton fiber is monosaccharides in the case of higher temperatures transformed from If the temperature dropped to 15.6 ℃, cotton fiber Can not form. Therefore, when the water and fertilizer conditions are basically satisfied, the temperature becomes the main factor. According to our hospital observation in Huacao area: the flowering to the vomit required about 1400 ℃ accumulated temperature, as the temperature dropped gradually increase the accumulated temperature in the drought and early frost come