棉花地膜覆盖,在北方棉区推广速度快,增产幅度大。但在南方以育苗移栽为主的地区,经几年多点试验、示范,虽能普遍取得明显的早发效果,但增产幅度却远逊于北方,有些地方甚至减产。为什么南方棉区棉花地膜覆盖早发效应显著而增产幅度却较小呢?为了摸索这方面的问题,1983年我们在南汇县农村基点进行了移栽棉花地膜覆盖栽培与露地栽培的对比试验,面积共20亩。 Cotton film mulching, popularized in the northern cotton area, yield increase. However, in the south, where seedling transplanting is the mainstay, after several years of trial and demonstration, although obvious early-onset effects have generally been obtained, the yield-growth rate is far below that of the north and the output is even reduced in some places. Why the southern cotton area cotton mulching early significant effect and the yield is significant but less it? In order to explore this issue, we in the rural areas of Nanhui County in 1983 were transplanted cotton film mulching cultivation and open field cultivation contrast test, the area A total of 20 acres.