Chinese cabbage has a long growth period, high yield, high nutrient demand, and the highest absorption of potassium, followed by nitrogen, calcium, phosphorus and magnesium.
Fertilizer characteristics:
Chinese cabbage has a long growth period, high yield, high nutrient demand, and the highest absorption of potassium, followed by nitrogen, calcium, phosphorus and magnesium. The characteristics of total fertilizer requirement are: less nutrient absorption during seedling stage, significantly increased rosette period, and maximum nutrient absorption during the core period. Adequate nitrogen nutrition is particularly important for promoting the formation of hypertrophic green leaves and improving photosynthetic efficiency. If the supply of phosphorus and potassium is insufficient in the later stage, it is often difficult to form a ball.
Fertilization technology:
At the medium fertility level, the fertilization amount per mu is 2,000 to 2,500 kg (or commercial organic fertilizer 300 to 350 kg), nitrogen fertilizer is 13 to 16 kg, phosphate fertilizer is 5 to 8 kg, and potassium fertilizer is 10 to 12 kg. Nitrogen and potassium fertilizers. Sub-base fertilizer and secondary topdressing, phosphate fertilizer is used as base fertilizer, fertilizer and farmyard manure (or commercial organic fertilizer).
Base fertilizer: 2000 to 2500 kg of farmyard manure or 300-350 kg of commercial organic fertilizer per mu, 4 to 5 kg of urea, 11 to 17 kg of diammonium phosphate, 6 to 7 kg of potassium sulfate, and 20 kg of calcium nitrate.
Topdressing: 10 to 12 kilograms of urea in the rose period, 7 to 9 kilograms of potassium sulfate; 10 to 12 kilograms of urea in the initial stage of the core, 7 to 9 kilograms of potassium sulfate.
Top dressing: spraying 0.3% calcium chloride solution or 0.25%~0.50% calcium nitrate solution during the growth period can reduce the incidence of dry heartburn. Spraying 0.5% to 1.0% urea or 0.2% potassium dihydrogen phosphate solution at the beginning of the ball can increase the commercial value of Chinese cabbage.
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