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南阳县棉办为了防治棉花红叶茎枯病,并验证钾肥对棉花有增产和提高品质的效应。1984年试验示范施用钾肥1.9万亩,效果良好。结果表明:施用钾肥棉田比对照棉田的叶功能期延长20～25天;发病株率降低21％以上;增产7.4～36.5％;单铃重增加0.3～0.5克,底分增加0.5～1.8％,绒长增长0.7～1.7毫米,细度增加30～180米/克,成熟系统增加0.03～0.14,强力增加0.01～0.28克。这就说明棉田施用钾肥,不仅对防治棉花红叶茎枯病和增产有明显效果,而且有助于纤维品质的提高。
Nanyang County Cotton Office in order to prevent and control cotton leaf blight, and verify that potash on cotton yield and improve quality effects. In 1984 experiment demonstration application of 19000 acres of potash, the effect is good. The results showed that the leaf functional period of cotton field was 20 ~ 25 days longer than that of the control cotton field. The rate of diseased plants was reduced by 21% or more, and the yield was 7.4 ~ 36.5%. The single boll weight increased 0.3 ~ 0.5g, The length of cashmere grows 0.7-1.7 mm, the fineness increases by 30-180 m / g, the mature system increases by 0.03-0.14, and the strong increase is 0.01-0.28 g. This shows that the application of potassium in cotton fields, not only for the prevention and treatment of cotton leaf blight and yield significant effect, but also help to improve fiber quality.