Guiding Opinions on Cotton Science Fertilization Technology in Huanghuaihai Region in 2013
(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.
2. Fertilization amount and proportion
Under the condition of 70-90 kg of lint cotton per mu, 2000 kg of high-quality organic fertilizer is applied, nitrogen fertilizer (N) is 11-13 kg, phosphate fertilizer (P2O5) is 5-7 kg, and potassium fertilizer (K2O) is 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 fertilizers is 1~2 kg per mu, and the concentration of leaves is 2 g/L, which is carried out in the bud-flowering period.
35%~40% of nitrogen fertilizer is used as base fertilizer, 30%~35% is used in early flowering stage, 25%~30% is used in full bloom period; 15% phosphate fertilizer is used as seed fertilizer, 85% phosphate fertilizer is used as base fertilizer; potassium fertilizer is used as base fertilizer or base Chasing (initial flowering) half. 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.
Expert Group on Soil Testing and Formula Fertilization Technology of the Ministry of Agriculture
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