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 with the aging of cotton roots, cotton plants are gradually falling into the situation of potassium deficiency. If potassium fertilizer is not added in time, 8 From late September to early September, there will be obvious symptoms of potassium deficiency. Symptoms When the cotton plant lacks potassium, the potassium will be transferred from the old leaves to the young tissues. Therefore, the potassium deficiency of the cotton will be the first to appear on the lower old leaves, the veins will remain green, and the leaves gradually turn green. In particular, in the middle and early September, in the condition of continuous low-temperature and autumn rain, the potassium-deficient cotton field will effectively stop the supply of available potassium in the soil, and the cotton plant will suddenly fail. The cotton leaves will turn yellow or become red in 2 to 3 days, then dry off and the stems will die. The death of cotton plants, this disease is also known as red stem blight. If potassium is not added in time before this, it will cause the upper part of the cotton plant to have little or no boll bells, a little bell hair, poor boll opening, reduced lint, leaf shedding, and even the death of the whole plant. Potassium and disease prevention After the autumn is the critical period for applying potassium fertilizer to cotton. Potassium application after cotton is usually carried out by extra-root fertilizer. Potassium sulfate potassium sulfate potassium sulfate 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. Spray potassium chloride Potassium oxide potassium up to 60%, but also more easily dissolved, but the cotton leaf is more sensitive to chloride ions, such as foliar spray fertilizer, it is generally appropriate to use 1% concentration, that is, chloride per acre 1 kg of potassium is sprayed on 100 kg of water, sprayed once every 7 days, and sprayed twice. Spraying plant ash leachate 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. Spraying potassium dihydrogen phosphate is generally sprayed with 0.2 kg of potassium dihydrogen phosphate and 100 kg of water per acre, sprayed once every 7 days, and sprayed twice. 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. Pigskin Cowhide Leather Work Gloves Bc Grade Leather Work Gloves,Rubberized Safety Cuff Gloves,Economy Leather Palm Glove,Custom Eather Palm Glove SHANDONG SHUNXING LABOUR PROTECTIVE CO.,LTD , https://www.sdsxlb.com