After the beginning of autumn, with the weakening of soil permeability and the decrease of ground temperature after ridging cotton fields, the ability of soil potassium supply is weakening day by day, and the root system of cotton plants is aging. If potassium fertilizer is not added in time, it will show obvious symptoms of potassium deficiency.
Potassium fertilizer after autumn: 1 potassium sulfate. The content of potassium oxide in potassium sulfate is 52%, and it dissolves quickly, with almost no precipitation. It is the first choice of potassium. General mu with 0.5 kg of potassium sulfate, spraying 100 kg of water, spraying once every 7 days, and even spraying 2 times. 2 Potassium chloride. Potassium oxide potassium chloride content of 60%, but also more easily soluble, but the cotton leaf is more sensitive to chloride ions, can be sprayed on the surface, generally 1 kg of potassium per mu, spraying 100 kg of water, every 7 days Spray once and spray twice. 3 Potassium dihydrogen phosphate. In general, 0.2 kg of potassium dihydrogen phosphate is used, 100 kg of water is sprayed, sprayed once every 7 days, and sprayed twice. It should be noted that potassium dihydrogen phosphate is only suitable for cotton fields where vegetative growth is excessive and late-maturing tends to occur. For premature aging, early maturing cotton fields and cotton fields where reproductive growth is more prosperous and vegetative growth is weak, potassium dihydrogen phosphate should not be sprayed.
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