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1. Reasonable application of base fertilizer According to the principle of “returning nutrient theoryâ€, according to the characteristics of cotton fertilizer, combined with the current reality, the cotton field with a yield of 350-400 kg per mu, 10 kg of urea per mu, 20 kg of diammonium phosphate, high quality Potassium fertilizer (purified potassium content of 50% or more) 30 kg. The middle-yielding field generally applies 20 kg of diammonium phosphate and potassium fertilizer per mu. In order to facilitate the continuous increase of cotton production, farmyard manure should be applied as much as possible. If the application of micro-fertilizer (including zinc, boron, manganese, molybdenum, copper, iron and six kinds of trace elements) of 800 to 1600 grams per mu, the yield increase effect is more significant.
2, scientific topdressing Phosphorus, potassium fertilizer is best to apply once. Nitrogen fertilizer should be applied in stages. Generally, fertility cotton fields can apply 30% nitrogen fertilizer in the bud stage and 70% nitrogen fertilizer in the flowering and boll period. Super high-yield cotton fields can apply 20% nitrogen fertilizer in the bud stage, and the flower and boll period should be applied. 60% of the nitrogen fertilizer, peach stage, 20% of the nitrogen fertilizer. The same amount of fertilization, nitrogen fertilizer staged more than 10% increase than the one-time application.
3, skillful application of foliar fertilizer Foliar fertilization is a more economical and effective way of fertilization, low cost and good effect. Foliar fertilizers based on nitrogen, phosphorus and potassium (especially in the seedling stage and late growth stage) should be used, and foliar fertilizers containing plant growth agents and trace elements should be applied. During the growth of cotton, 0.5% to 2% diammonium phosphate or 0.2% potassium dihydrogen phosphate or 0.15% to 0.3% anti-disease production king solution can be used, combined with the prevention and control of pest and leaf spraying, the effect is better.
Source: Dong'e County Agricultural Bureau Soil and Fertilizer Station
Cotton production and fertilization production technology
In the production of cotton, reasonable fertilization should be carried out according to the characteristics of crops requiring fertilizer and the law of fertilizer requirement. In the past, the ratio of demand for nitrogen, phosphorus and potassium in non-insect-resistant cotton varieties was 3:1:3, and the commonly grown transgenic cotton was sensitive to potassium, requiring a large amount of potassium, and its nitrogen, phosphorus and potassium. The demand ratio is preferably 3:1:4.5. According to the basic principle of fertilization "minimum nutrient law" and "irreplaceable law", if potassium fertilizer and micro-fertilizer are lacking, it is the application of more nitrogen fertilizer and phosphate fertilizer. Therefore, the steady application of nitrogen fertilizer, phosphate fertilizer, increase of potassium fertilizer, supplement micro-fertilizer, so that cotton "satisfaction" and "eat well", in order to maximize the high yield and efficiency.
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