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1984～1989年间,全省231个棉花田间、微区、培养试验结果表明,棉田严重缺钾仅占1.3—1.9%;供钾中量者占17.9—30.7%.供钾高量者占68.0—80.1%.土壤速效钾(K_2O)<80ppm为严重缺钾,必须施用钾肥;80—110ppm为缺钾,注意施用钾肥;110—125ppm属潜在性缺钾,酌情施用钾肥;125—140ppm为富钾,>140ppm为极富钾,不需施用钾肥.棉叶含钾量与土壤速效钾呈正相关,其中以上部叶柄含钾量关系最密切,次为上部叶片和下部叶叶柄.
Between 1984 and 1989, 231 cotton fields, micro-regions and cultivation tests in the province showed that only a serious potassium deficiency accounted for 1.3-1.9% of the cotton fields and 17.9-30.7% of the total potassium in the cotton fields, and a high amount of potassium accounted for 68.0% 80-1% .K2O <80ppm is serious potassium deficiency, potassium fertilizer must be applied; 80-110ppm potassium deficiency, pay attention to the application of potassium fertilizer; 110-125ppm is a potential potassium deficiency, as appropriate, potassium fertilizer; 125-140ppm is potassium ,> 140ppm potassium is very potassium, potassium fertilizer is not needed.The potassium content in cotton leaves is positively correlated with soil available potassium, of which potassium content in the upper part of the petiole is the most closely related, followed by the upper leaves and the lower leaf petiole.