Symptoms of potassium deficiency in cotton fields: During the flowering and ringing period of cotton, the leaf color of the upper part of the main stem of cotton turns from pale yellow to dark green. Yellow spots appear in the green veins, then brown, and then the leaves shrink, brittle, reddish brown and fall off, cotton bolls are thin, easy to premature aging, analysis of cotton stem stem end of the tube is not infected, and verticillium The end of the vascular stem of the cotton plant was yellowish brown.
The prevention methods are as follows:
1. Improve cotton farmers' understanding of increasing potassium fertilizer, because increasing potassium fertilizer can not only accelerate cotton flower bud differentiation, reduce bud bell falling off, but also promote cotton plant's respiration to nitrogen fertilizer, increase cotton leaf function and production stamina.
2. Rational and scientific application of potash fertilizer. The absorption of potassium fertilizer in cotton during the whole growth period is generally less in the early stage, more in the middle and late stages, and the absorption of potassium fertilizer after flowering accounts for about 80% of the whole growth period. Therefore, each mu of cotton field should be applied about 12.5 kg of potash. The bud period is about 7.5 kg. In the middle and late stages, potassium fertilizer such as potassium dihydrogen phosphate can be sprayed in an appropriate amount, sprayed once every 7-10 days, and sprayed about 3 times.
The prevention methods are as follows:
1. Improve cotton farmers' understanding of increasing potassium fertilizer, because increasing potassium fertilizer can not only accelerate cotton flower bud differentiation, reduce bud bell falling off, but also promote cotton plant's respiration to nitrogen fertilizer, increase cotton leaf function and production stamina.
2. Rational and scientific application of potash fertilizer. The absorption of potassium fertilizer in cotton during the whole growth period is generally less in the early stage, more in the middle and late stages, and the absorption of potassium fertilizer after flowering accounts for about 80% of the whole growth period. Therefore, each mu of cotton field should be applied about 12.5 kg of potash. The bud period is about 7.5 kg. In the middle and late stages, potassium fertilizer such as potassium dihydrogen phosphate can be sprayed in an appropriate amount, sprayed once every 7-10 days, and sprayed about 3 times.
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