1. Lightly applying seedling fertilizer: Cotton seedlings can promote root development and cultivate strong seedlings. Miao fertilizer is generally based on nitrogen fertilizer, which can be determined according to the condition of seedling, soil and base fertilizer. For cotton fields with poor ground strength, insufficient base fertilizer and weak growth, 5-10 kg of urea or high-nitrogen compound fertilizer (agricultural land, commercial and residential land, industrial land) should be applied per mu, and the ditch should be applied. For cotton fields with high fertility and base fertilizer, you can not apply for seedlings.

2. Stable application of bud fertilizer: The demand for nutrients gradually increases after cotton buds, and the bud period is reasonable for topdressing, which can meet the needs of cotton planting, coordinate the relationship between vegetative growth and reproductive growth, and promote the stable growth of plants. Generally, 15-20 kg of Stanley compound fertilizer is applied in the early stage of cotton buds. The method of top dressing is better by ditching deep and maintaining a proper distance from the cotton plant to avoid root damage and affect normal growth.

3, re-applying flower bell fertilizer: cotton flowering and bolling period is the period when cotton needs most fertilizer, re-applying flower bell fertilizer has a significant effect on fighting for "three peaches". Generally, the application of urea Stanley compound fertilizer is 20-30 kg. For cotton fields with poor soil fertility, less base fertilizer and weak growth, it can be applied early, when the cotton plants bloom more than 80%, and when 1-2 young peaches are sitting, the topdressing method is appropriate.

4, supplement application of topping fertilizer: supplement application of topping fertilizer mainly to prevent cotton deficiency and premature aging in the late stage, promote plant steady growth, enhance disease resistance, insect resistance, anti-premature aging ability, and strive to multi-gate autumn peach and increase the weight of the bell. Generally, the top dressing is carried out before and after topping. For the nitrogen-deficient or prematurely-deficient cotton field, 50-75 kg of 1% urea solution is sprayed per acre, once every 5-7 days, and even sprayed 2-3 times. For the phosphorus-deficient, potassium-producing or late-growing green cotton field, spray 0.2% potassium dihydrogen phosphate solution every 7-10 days, even spray 2-3 times to reach the later stage without yellow leaves, no leaves, no premature aging, high yield. High quality purpose.

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Active Pharmaceutical Ingredients

Active Pharmaceutical Ingredients(API) refer to the raw materials used in the production of various preparations. They are the effective ingredients in the preparations. They are various powders, crystals, extracts, etc., prepared by chemical synthesis, plant extraction or biotechnology, but Substances that the patient cannot take directly. API is intended to be used in any substance or mixture of substances in the manufacture of pharmaceuticals, and when used in pharmaceuticals, it becomes an active ingredient of the pharmaceuticals. Such substances have pharmacological activity or other direct effects in the diagnosis, treatment, symptom relief, treatment or prevention of diseases, or can affect the function or structure of the body. According to its source, active pharmaceutical ingredients are divided into two categories: synthetic chemical active Pharmaceutical ingredients and natural chemical active Pharmaceutical ingredients.

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