1. Fertility requirements: Chinese cabbage has a long growth period, high yield, and a great demand for nutrients. The absorption of potassium is the highest, followed by nitrogen, calcium, phosphorus and magnesium. The total requirement fertilizer is characterized by less nutrient absorption during the seedling stage, a significant increase in the rosette period, and the absorption of nutrients at the heart-packing stage. Adequate nitrogen nutrition is particularly important for promoting the formation of hypertrophic green leaves and enhancing photosynthetic efficiency. If the supply of phosphorus and potassium is insufficient in the later period, it is often difficult to make the ball.
2. Fertilization technology: The fertilization amount per mu for the whole growing period under medium fertility level is 2000-2500 kg of farmyard fertilizer (or 300-350 kg of commodity organic fertilizer), 13-16 kg of nitrogen fertilizer, 5-8 kg of phosphate fertilizer, and 10-12 potassium fertilizer. Kilograms, nitrogen and potassium fertilizers are used as base fertilizers and secondary fertilizers. Phosphate fertilizers are all used as base fertilizers and fertilizers and manure (or commodity organic fertilizers) are mixed and applied.
Basal fertilizer: 2000-2500 kg of farmyard fertilizer or 300-350 kg of commercial organic fertilizer, 4-5 kg ​​of urea, 11-17 kg of diammonium phosphate, 6-7 kg of potassium sulfate, and 20 kg of calcium nitrate per mu.
Top dressing: Mushi 10-11 kg of urea during the lotus period, 7-9 kg of potassium sulfate; urea 10-12 kg, and 7-9 kg of potassium sulphate in the early stage of the core.
Fertilizer outside the root: 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%-1.0% urea or 0.2% potassium dihydrogen phosphate solution at the beginning of the ball can increase the commercial value of Chinese cabbage.
disinfection of mucous membrane : The process of killing or removing mucosal pathogenic microorganisms such as oral cavity, nasal cavity, vagina and external genitalia, and achieving disinfection requirements.
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Oral Disinfectant
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