1. Requirements of Fertilizer Fermentation: The growth of lettuce with lettuce is rapid, and nitrogen fertilizer is preferred. The amount of fertilizer is small at the initial stage of growth. After entering the ball stage 70-80 days after sowing, the nutrient uptake increases sharply. During the first month of the bulbous period, The absorption of nitrogen can account for more than 80% of the total growth period. The absorption of phosphorus and potassium is similar to that of nitrogen. In particular, the absorption of potassium not only has a large amount of absorption, but also continues to be harvested. K deficiency during the ball stage seriously affects the weight of the leaves. Phosphorus deficiency at seedling stage has the greatest impact on growth.
2. Fertilization technology: Fertilizer production per hectare is 2500-3000 kg of farmyard fertilizer (or 350-400 kg of commodity organic fertilizer), 14-17 kg of nitrogen fertilizer, 6-8 kg of phosphate fertilizer, and potassium fertilizer. 11-13 kg. Nitrogen and potassium fertilizers were used as base fertilizers and secondary fertilizers. Phosphate fertilizers were all used as base fertilizers. Fertilizer and farmyard fertilizer (or commodity organic fertilizer) are mixed and applied.
Basal fertilizer: Apply 2500-3000 kg of farmyard fertilizer or 350-400 kg of commercial organic fertilizer per mu, 4-5 kg ​​of urea, 13-17 kg of diammonium phosphate, 7-8 kg of potassium sulfate, and 20 kg of calcium nitrate.
Top dressing: in the lotus stage Mushi 11-14 kg of urea, 8-9 kg of potassium sulfate; the beginning of the center of Mushi 11-14 kg of urea, 8-9 kg of potassium sulfate.
Root dressing: The lotus leaf was sprayed with 1% calcium nitrate solution, sprayed continuously three times, sprayed once every 7 days, and stopped spraying after the end of the rosette period. Facilities can be grown with carbon dioxide gas fertilizer.
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