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棉花后期叶面喷肥要注意以下5个要点:一、喷洒部位。棉叶朝上的向阳面是细胞排列紧密且光滑的栅栏组织,附着吸收能力差,而背面则是疏松的海绵组织,表面粗糙茸毛多,肥液能很好附着上面。故喷药时要将喷雾器喷头朝上对着叶片背面喷洒。二、喷肥选择。棉花晚发及后期早衰,可喷2%的尿素水。棉花旺长及防治棉铃脱落,可喷300～500倍液的磷酸二氢钾、1%～3%的过磷酸钙以及5000～10000倍的爱农植物生长调节剂、8000倍液的翠竹牌植物生长调节剂等,均可收到增强光合作用,调节营养与生殖生长的关系,减少蕾铃脱落,消除药害等效果。三、喷施数量。掌握肥液沾满棉叶背面欲滴不滴为宜,依棉田叶面积大小用量为每亩50～75公斤。
Cotton late foliar fertilizer should pay attention to the following five points: First, spraying parts. The sunny side of the cotton leaf is closely packed and smooth palisade cells, poor adhesion absorption, while the back is loose sponge tissue, surface hair and more hair, fertilizer can be well attached to the above. Therefore, spraying the sprayer nozzle should be sprayed on the back of the blade facing up. Second, the choice of fertilizer. Cotton late and late premature aging, can spray 2% urea water. Cotton bloom and cotton boll off control, 300 to 500 times the spray can be sprayed potassium dihydrogen phosphate, 1% to 3% of superphosphate and 5000 to 10000 times Agronomy plant growth regulator, 8000 times the Tsui licensing licensing Plant growth regulators, etc., can receive increased photosynthesis, regulate the relationship between nutrition and reproductive growth, reduce the loss of buds, eliminate the effects of injury and so on. Third, the number of spraying. Grasping the back of the soaked liquid cotton leaf dripping is not appropriate, according to the size of the cotton leaf area of 50 to 75 kg per acre.