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The application rate of the base fertilizer generally accounts for about 60% of the cotton fertilizer requirement. The application of fertilizer should be based on organic fertilizer and high-content multi-component fertilizer. The seedling stage should be based on the application of nitrogen fertilizer. This is because: the nitrogen content in cotton seedlings accounts for 3.3%, which is higher than other growth stages. At the same time, the development rate of underground main roots in seedling stage is 4-5 times higher than that of aboveground young stems. Hair cross", when the three leaves of cotton seedlings are true, the flower buds begin to differentiate, and early application of nitrogen fertilizer can promote the development and transformation of flower buds.
From the bud stage to the early flowering stage, the growth rate of the main stem is the fastest, and the plant is very prone. Therefore, fertilization should also be based on organic fertilizer and multi-component fertilizer during this period to promote its stability. The flowering and bolling period and the belling period are generally based on the application of multiple compound fertilizers and urea, especially in the period of Shengling, it is necessary to apply peach fertilizer to prevent premature aging.
Potassium fertilizer can not be less than cotton, generally 30 kg of potassium fertilizer should be applied per mu in cotton fields. Nowadays, farmers use inorganic compound fertilizers. The formulas of nitrogen, phosphorus and potassium in these fertilizers are generally equal. For example, in 45% of compound fertilizers, nitrogen, phosphorus and potassium are 15% each; 51% of compound fertilizers Nitrogen, phosphorus and potassium each contain 17%. The demand for phosphorus in cotton is relatively small, and the use of high-phosphorus compound fertilizer is undoubtedly a great waste. The use of high-content multi-component fertilizers has been used to reduce the amount of single potash as appropriate. For example, in every 4 kg of 45% NPK compound fertilizer, the potassium oxide contained is equivalent to 12.5 kg of potassium chloride; in 50% of the 50% NPK compound fertilizer, the potassium oxide contained is equivalent to 14.15 kg of chlorine. Potassium. Can not completely replace the elemental potash fertilizer because of the application of compound fertilizer.
Cotton with increased application of organic fertilizer has high yield and long-term decline. Because the nutrient content of organic fertilizer is relatively abundant, it should be noted that its fertilizer efficiency is relatively slower than that of chemical fertilizer. When purchasing and applying, pay attention to the following points: First, the purchased bio-organic fertilizer should not be stored together with chemical pesticides to prevent damage to functional microorganisms while avoiding direct sunlight; second, bio-organic fertilizer should be applied with chemical fertilizers to make quick-acting It is necessary to release the cotton for the late-effect nutrient in batches. At the same time, it is necessary to understand that the organic fertilizer cannot replace the potassium fertilizer, and the potassium-deficient cotton field must be applied with the potassium fertilizer. The third is to apply it in the case of appropriate sensation, and timely irrigation should be carried out in case of continuous drought; Ditch or squat deep, or spread it and plow it. According to the test of the agricultural scientific research department, whether it is organic fertilizer or inorganic fertilizer or organic-inorganic compound fertilizer, the deep application of 20 cm is about 3 to 5 percentage points higher than that of shallow application and spreading.
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How to apply fertilizer to ensure that cotton grows early and does not decay prematurely
The demand for fertilizer in different growth stages of cotton is different. In the key points of fertilization, we must do the best (base) fertilizer foot, seedling speed, bud fertilizer stability, flower bell fat, and general application of peach fertilizer. This fertilization will enable cotton to achieve early growth and long-term decline.
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