Answer: Li Shengyin, a researcher at Northwest A&F University and a consulting expert in the Yangling Old Science and Technology Association, said: 1. Cotton basic fertilizer: generally 2 to 3 tons of organic fertilizer per acre, with 3 kg of urea, 20 kg of superphosphate, and potassium chloride 10 kg. The basic fertilizer of cotton should be turned into the soil to meet the requirements of cotton roots.
2. Cotton seed fertilizer: generally use nitrogen and phosphate fertilizers, apply 2 to 3 kg of ammonium sulfate and 4 to 5 kg of superphosphate per mu, and mix with decomposed organic fertilizer. However, contact with seeds should be minimized.
3. Cotton seedling fertilizer: when 2 to 3 leaves, about 3 kg of urea per acre is applied to the water.
4. Cotton bud fertilizer: 2 to 3 kg of urea per acre, or 5 to 10 kg of 45% compound fertilizer.
5. Cotton flower bell fertilizer: According to the growth of cotton and soil conditions, top dressing shall be divided into three times. For the first time, about 1 to 2 tons of human and animal manure, 10 kg of phosphate fertilizer, and 10 kg of oil cake are usually used per mu, combined with cultivating, and trenching is applied to the soil. The second time is the re-application of Shenghua fertilizer. About 20 days after the application of the initial flower fertilizer, the lower part of the cotton plant has begun to boll. At this time, the re-application of top dressing usually does not cause long legs, and can be used for early knot peach, multi-knot peach, etc. Reduce the fall of lei bells and lay a foundation for nutrients. Generally, 5 kg of urea, 7 kg of phosphate fertilizer, 5 kg of potassium fertilizer, and 10 kg of oil cake per mu are better. The third time is to apply Qiu Taofei. To apply early, apply 3-4 kg of urea per mu. If there is not much peach fruit in the early stage, the soil fertility is better, and autumn peach fertilizer can be applied with little or no application.
6. Application of micro-fertilizer: The soil available in my country has low boron, cotton boron deficiency is more common, and the effect of boron application is significant. The application of boron fertilizer can usually be sprayed with 0.1%~0.2% borax solution for 2 to 3 times continuously from the seedling stage to the flowering stage of cotton. For zinc deficiency, use 1 to 1.3 kg of zinc fertilizer (zinc sulfate, etc.) as organic fertilizer for each acre, and use 0.2% zinc fertilizer solution to spray at the bud stage and flower bell stage.
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