1. Spray leaching of grass ash: Grass ash is rich in potassium. In general, per acre with 2 kg of plant ash and 100 kg of water, the leachate is filtered, sprayed once every 5 days, and sprayed 2 or 3 times.
2, spraying potassium dihydrogen phosphate: generally 0.2 kg per kg of potassium dihydrogen phosphate spray 100 kg of water, spray once every 7 days, and even spray 2 times. It should be noted that potassium dihydrogen phosphate is only suitable for use in cotton fields where vegetative growth is prosperous and has a late maturation trend; potassium dihydrogen phosphate cannot be sprayed on cotton fields with premature vegetative, early-maturing cotton fields, and fertile reproductive growth and weak vegetative growth.
3, spray potassium sulfate: Potassium sulfate potassium up to 52%, fast dissolution, almost no precipitation, is the first choice for potassium. Generally, 0.5 kg of potassium sulfate is sprayed on 100 kg of water per acre, sprayed once every 7 days, and sprayed twice.
4, spray potassium chloride: Potassium oxide potassium up to 60%, but also more easily soluble, but the cotton leaf is more sensitive to chloride ions, such as foliar spray fertilizer, generally suitable concentration of 1%, that is, per acre Use 1 kg of potassium chloride to spray 100 kg of water, spray once every 7 days, and spray twice.
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