Autumn Lettuce Fertilization Technology
1. The basal fertilizer is applied once to decompose farmyard manure 1000-1500 kg/mu. 2. Yield level above 3500 kg/mu: nitrogen fertilizer (N) 16~18 kg/mu, phosphate fertilizer (P2O5) 7~9 kg/mu, potassium fertilizer (K2O) 8~10 kg/mu. 3. The output level is 2500~3000kg/mu: nitrogen fertilizer (N) is 14~16kg/mu, phosphorus fertilizer (P2O5) is 5~6kg/mu, potassium fertilizer (K2O) is 6~8kg/mu. 4. Output level 1500~2000kg/mu: nitrogen fertilizer (N) 12~14kg/mu, phosphate fertilizer (P2O5) 4~5kg/mu, potassium fertilizer (K2O) 5~6kg/mu. The acidity of lettuce is very poor. When the vegetable garden soil in the southern region has a pH of less than 5, 150-200 kg of lime are used per acre. All nitrogen fertilizers were topdressed, followed by 30% topdressing at 20%, 30%, and 50% in the returning green period, rosette period, and early growth period. Potassium fertilizer was applied at 40% to 50%, and the rest was in the rosette stage and early growth stage. For the topdressing in two rounds, all of the phosphate fertilizers were applied as base fertilizer or applied.
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