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一、棉田肥力下降的剖析1、棉田土壤肥力指标。棉田土壤速效磷和速效钾的含量,同棉花产量有密切的关系。据全区1671块棉田调查,速效磷低于5PPM,速效钾低于60PPM,皮棉亩产随着速
First, the decline of cotton field analysis 1, cotton soil fertility indicators. Cotton soil available phosphorus and available potassium content, with the cotton yield are closely related. According to a survey of 1,671 cotton fields in the region, available phosphorus is less than 5PPM, available potassium is less than 60PPM,