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1979年以来,朝阳地区开展了棉花地膜覆盖试验。1981年全区已有52个公社,128个大队,302个生产队搞了棉花地膜覆盖栽培,使全区覆盖面积达到7276亩。这项新技术措施能得到如此迅速的发展,主要是因为在解决朝阳棉区的低温、干旱、无霜期短等主要矛盾上起到了很大作用。一、地膜覆盖对土壤温度的效应朝阳地区棉花的播种适期为4月下旬,最迟推延到5月上旬。从棉花生长发育对温度关系看,不同品种萌发所需的最低临界温度为10.5～12℃,而出苗对温度的要求一般比萌发
Since 1979, cotton film mulching test has been carried out in Chaoyang area. In 1981, there were 52 communes, 128 brigades and 302 production teams engaged in cotton mulch covering cultivation in the whole region, covering a total area of 7276 mu. The rapid development of this new technological measure is mainly due to the great role it played in solving major contradictions such as low temperature, drought and short frost-free period in the Chaoyang cotton area. First, the effect of plastic film mulching on soil temperature Cotton planting in Chaoyang area is suitable for late April and late in early May. According to the relationship between the growth and development of cotton and the temperature, the minimum critical temperature required for germination of different varieties is 10.5-12 ℃, while the temperature requirement of emergence is generally higher than that of germination