本地区70%以上耕地土壤速效磷为5PPm左右,属普遍缺磷状态。目前棉花生产上大都施用磷肥,一般为每亩过磷酸20～25公斤,有的多到50公斤左右。但据过去有些试验,在棉花上施磷增产效果不显著,同时磷肥资源比较紧缺,而且是非再生资源。因此有必要 More than 70% of the soil available phosphorus in arable land in this region is about 5PPm, which is a common deficiency of phosphorus. At present, most of the production of phosphate fertilizer on the use of cotton, usually per acre 20 to 25 kilograms of phosphoric acid, and some as much as 50 kilograms. However, according to some experiments in the past, the effect of applying phosphorus on cotton yield was not significant. At the same time, there was a shortage of phosphate fertilizer resources and was a non-renewable resource. So it is necessary