1. The base fertilizer is applied once 1000-1500 kg/mu of decomposed farmyard manure. 2. The production level is more than 3500 kg/mu: nitrogen fertilizer (N) 16~18 kg/mu, phosphate fertilizer (P2O5) 7~9 kg/mu, potash fertilizer (K2O) 8~10 kg/mu. 3. The production level is 2500~3000 kg/mu: nitrogen fertilizer (N) 14~16 kg/mu, phosphate fertilizer (P2O5) 5~6 kg/mu, potash fertilizer (K2O) 6~8 kg/mu. 4. The production level is 1500~2000 kg/mu: nitrogen fertilizer (N) 12~14 kg/mu, phosphate fertilizer (P2O5) 4~5 kg/mu, potash fertilizer (K2O) 5~6 kg/mu.
The acid resistance of lettuce is very poor. When the soil pH of the vegetable garden in the south is less than 5, 150 to 200 kg of quicklime is applied per acre. Nitrogen fertilizers are all topdressed, according to 20%, 30% and 50% in the transplanting and returning period, the rosette stage and the early stage of rapid growth, the application of the potassium fertilizer is 40%~50%, and the rest is in the rosette stage and the early stage of rapid growth. After two times of application, the phosphate fertilizer is used as the base fertilizer or acupoint application.
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