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The amount of nitrogen and phosphorus fertilizer in the Huanghuai sponge area is generally high, and the application of organic fertilizer is insufficient; the amount of base fertilizer is too large, and the amount of topdressing is insufficient; the deficiency of trace elements boron and zinc is more common.
2. Fertilization principle
(1) Add organic fertilizer and promote organic and inorganic cooperation.
(2) According to the soil fertility conditions, the amount of nitrogen and phosphorus fertilizers should be appropriately adjusted, and the potassium fertilizer should be applied reasonably, paying attention to the combined application of boron and zinc.
(3) Nitrogen fertilizer application in stages, appropriate increase in the proportion of nitrogen fertilizer application in the middle growth period.
(4) Fertilizer application should be combined with high-yield and high-quality cultivation techniques. 3. Fertilization amount and proportion
Under the condition of 70~90 kg per mu of cotton, the total amount of fertilization is 2000 kg of high-quality organic fertilizer, nitrogen fertilizer (N) 11~13 kg, phosphate fertilizer (P2O5) 5~7 kg, potassium fertilizer (K2O) 5~7 kg. . For cotton fields lacking boron and zinc, pay attention to the application of boron and zinc fertilizers. The dosage of boron and zinc fertilizer is 1~2 kg per mu, and the concentration of leaves is 2 g/L, which is carried out from the bud to the flowering stage.
35%~40% of nitrogen fertilizer is used as base fertilizer, 30%~35% is used in the initial flowering period, 25%~30% is used in the flowering period; all the phosphate fertilizer is used as the base fertilizer; all the potassium fertilizer is used as the base fertilizer or the base pursuit (the initial flowering period). . Starting from the flowering period, the cotton field with weaker growth will be sprayed with 0.5%~1.0% urea and 0.3%~0.5% potassium dihydrogen phosphate solution 50~75 kg/mu in combination with the application, every 7~10 days. Spray continuously for 2~3 times.
Cotton Fertilization Technology in Huanghuaihai Region
1. The main problem
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