Cotton fertilization should increase organic fertilizer and reduce nitrogen and phosphorus fertilizer
Principles of Fertilization
(1) Increase the application of organic fertilizers, and advocate the replacement ratio of organic fertilizers above 20%, but not higher than 35%.
(2) According to the soil fertility status and fertilizer effect response, appropriately reduce the amount of nitrogen and phosphorus fertilizers and stabilize the amount of potassium fertilizer.
(3) The cotton fields with obvious lack of soil boron and zinc should be applied with boron and zinc fertilizers as the base. For those with potential deficiency, the application of boron and zinc fertilizers outside the roots should be paid attention to.
(4) For seedlings and transplanting cotton fields, phosphorus and potassium fertilizers are applied in a concentrated way such as hole or strip application.
(5) Fertilizer application should be combined with irrigation drainage and other high-yield and high-quality cultivation techniques.
Fertilization recommendations
(1) Under the condition of 90-110 kg of lint per mu, high-quality organic fertilizer shall be applied over 1.5 tons, nitrogen fertilizer (N) 13-15 kg, phosphate fertilizer (P2O5) 6-7 kg, and potash fertilizer (K2O) 10-12 kg. . For cotton fields lacking boron and zinc, pay attention to supplementary application of borax 1-2 kg/mu and zinc sulfate 1.5-2 kg/mu. For low-yield fields, appropriately reduce the amount of fertilizer applied by about 20%.
(2) All organic fertilizers are applied to the soil as base fertilizer before plowing. Nitrogen fertilizer 25%-30% is used as basal application, 25%-30% is used as top-dressing in the first flowering period, 25%-30% is used as top-dressing in blooming stage, 15%-20% is used as top-dressing in boll stage; all phosphate fertilizers are used as basal application; potassium fertilizer 60% is used as base fertilizer, and 40% is used as top dressing in the first flowering period. From the blooming period, spray 0.5%～1% urea and 0.3%～0.5% potassium dihydrogen phosphate solution 25～30 kg/mu on the weaker cotton field, spray once every 7～10 days, and spray 2 continuously. ~3 times.
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