近年来,随着氮、磷素肥料施用量的增加和单位面积产量的提高,在大田生产中,棉株因缺钾诱发的红、黄叶枯死现象日益普遍。对进一步提高产量、质量已造成严重影响。以瑞昌为例,全县八万五千亩棉花,不同程度的红、黄叶枯死发病面积将近三分之一。少数发病严重的单位,发病面积达一半以上。每年棉株现蕾后,由于植株需钾量急剧上升,棉株病情明显。叶片从上而下逐渐枯黄,生理功能减退,不过八月就未老先衰。有的地块叶片脱落成为光杆。全县各地,只有发病面积大小和病情轻重之分,而 In recent years, along with the increase of nitrogen and phosphorus fertilizer application rate and the increase of yield per unit area, the red and yellow leaf withering of cotton plants due to potassium deficiency is increasingly common in field production. To further improve the output, quality has been seriously affected. To Ruichang, for example, the county 85,000 acres of cotton, varying degrees of red, yellow leaf morbidity area of ​​nearly one-third. A few serious cases of the unit, the incidence of more than half. Cotton buds each year, due to a sharp increase in potassium demand plants, cotton plants significantly. Leaves gradually yellowish from top to bottom, physiological function decline, but not in August before the first decline. Some plots of leaves fall into polished rod. All over the county, only the size of the incidence and severity of the disease, and