1. Fertilization Principles
(1) Apply organic fertilizer and promote the integration of organic and inorganic fertilizers to improve soil structure and nutrient availability.
(2) Adjust the application of nitrogen and phosphorus fertilizers based on soil fertility levels, and apply potassium fertilizer appropriately. It is also important to combine boron and zinc fertilizers for balanced nutrition.
(3) Apply nitrogen fertilizer in stages, with a higher proportion applied during the mid-growth period to support vigorous plant development.
(4) Combine fertilizer application with high-yield and high-quality cultivation practices to maximize both yield and quality.
2. Fertilizer Application Rates and Proportions
Under conditions where lint cotton yields range from 70 to 90 kg per mu, it is recommended to apply 2000 kg of high-quality organic fertilizer, along with 11–13 kg of nitrogen (N), 5–7 kg of phosphate (P₂O₅), and 5–7 kg of potash (K₂O). For fields lacking boron and zinc, it is essential to apply these micronutrients. The recommended dosage is 1–2 kg per mu, with foliar sprays at a concentration of 2 g/L, applied during the bud and flowering stage.
Of the total nitrogen fertilizer, 35%–40% should be used as base fertilizer, 30%–35% during the early flowering stage, and 25%–30% during full bloom. Phosphate fertilizer should be split, with 15% used as seed fertilizer and 85% as base fertilizer. Potassium fertilizer can be applied as a base fertilizer or during the initial flowering stage. Starting from the flowering period, for cotton fields with weaker growth, spray a solution of 0.5%–1.0% urea and 0.3%–0.5% potassium dihydrogen phosphate at a rate of 50–75 kg per mu. This should be done every 7–10 days, with 2–3 applications in total.
Expert Group on Soil Testing and Formula Fertilization Technology of the Ministry of Agriculture
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