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近年来,棉区由于氮肥施用量较多,磷肥施用量较少,土壤缺磷现象十分严重。从我县1977年423块棉田的土壤肥力普查的结果看,缺磷田块占57.8%。这些缺磷棉田的表现是:棉株叶色暗中带紫,株植矮小不发苗,追了氮素化肥后,生长仍然缓慢,棉桃小,铃壳厚,衣分低,纤维品质差,影响了棉花产量和品质。为了弥补棉田磷肥施用量不足,我县各级农科所,大搞叶面喷磷的试验示范,在棉花花铃期结合治虫,在叶面上喷施1%的过磷酸钙溶液3—4次,不仅可以起到壮桃
In recent years, cotton area due to the amount of nitrogen applied more, less phosphate, soil phosphorus deficiency is very serious. According to the results of the soil fertility survey of 423 cotton fields in our county in 1977, 57.8% of the total phosphorus-deficient fields were found. The performance of these phosphorus-deficient cotton fields is: cotton leaf color with dark purple, short stature without plant seedlings, chasing the nitrogen fertilizer, the growth is still slow, small bolls, bell shell thickness, low lint, poor fiber quality, the impact Cotton yield and quality. In order to make up for lack of phosphate fertilizer application in cotton fields, our county agricultural research institutes at all levels devoted themselves to experiment and demonstration of spraying phosphorus on the foliage. In combination with pest control on cotton bollworms, 1% of superphosphate solution 3-4 Times, not only can play strong peach