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我市有相当一部分棉花常发生红叶茎枯病。发病严重的,8月上旬棉叶全部脱光造,成产量锐减。1981年以来,我们对棉花红叶茎枯病的成因与防治进行了试验研究,结果表明,棉花红叶茎枯病与土壤缺钾密切相关,施用钾肥有明显的防病效果。 研究采取大田调查与小区试验相结合的方法。小区试验,随机排列,每亩基施水粪肥10担、含9%P_2O_5的过磷酸钙50公斤,追施蕾肥碳酸氢铵15公
A considerable part of my city cotton leaf blight occurs often. Serious onset, in early August cotton strip all made, as production dropped sharply. Since 1981, we conducted a pilot study on the causes and control of cotton leaf blight. The results showed that cotton leaf blight was closely related to soil potassium deficiency, and potassium fertilizer had obvious anti-disease effect. The study adopted a combination of field investigation and community testing. Plot test, randomly arranged, water per mu base 10 manure, water, containing 50% of the superphosphate 9% P_2O_5, topdressing 15 grams of ammonium bicarbonate fertilizer