我省四、五月份气温多变,普遍偏低,影响棉花出苗、生长。1979、1980年我们进行了塑料薄膜复盖试验。1979年自棉花播种到一叶期采取“小拱棚盖”。1980年采取自播种到三叶期“小拱棚盖”和自播种到现蕾“地面行间盖”两种方法。密度皆每亩4,080株。试验结果,用塑料薄膜复盖的比不复盖的增产10—15%。 In our province, the temperature in May and May is changing and generally low, affecting cotton emergence and growth. 1979, 1980, we conducted a plastic film cover test. In 1979, since the sowing of cotton to the leaf stage to take “small arch cover ”. In 1980 to sow from the three-leaf period “small arch cover ” and from sowing to squash “ground line between the cover ” two methods. The density of 4,080 plants per acre. Test results, the plastic film covered than the non-covered yield 10-15%.