Fertilization principle
In view of the problem that the application amount of organic fertilizer in lettuce production is small, the phenomenon of blind application of nitrogen fertilizer is prominent, the application amount of phosphorus and potassium fertilizer is insufficient, and the fertilization period and method are unreasonable, the following fertilization principles are proposed:
(1) Adding organic fertilizer, controlling nitrogen fertilizer, and increasing potassium fertilizer; (2) The method of fertilizer distribution is based on base and chasing. Topdressing is mainly based on nitrogen fertilizer, and rational application of potassium fertilizer;
(3) For acidified vegetable gardens, acid soil conditioners such as lime should be applied in an appropriate amount;
(4) Fertilization combined with high-quality cultivation techniques, especially water management, to improve the efficiency of fertilizer and water use.
2. Fertilization advice
(1) Applying decomposed farmyard manure 1000~1500 kg/mu at a time;
(2) The production level is above 3500 kg/mu, nitrogen fertilizer (N) is 10~12 kg/mu, phosphate fertilizer (P2O5) is 4~6 kg/mu, and potassium fertilizer (K2O) is 10~14 kg/mu;
(3) The production level is 2500~3500 kg/mu, nitrogen fertilizer (N) 6~10 kg/mu, phosphate fertilizer (P2O5) 3~4 kg/mu, potash fertilizer (K2O) 8~10 kg/mu;
(4) The production level is 1500~2500 kg/mu, nitrogen fertilizer (N) 5~6 kg/mu, phosphate fertilizer (P2O5) 2~3 kg/mu, potash fertilizer (K2O) 6~8 kg/mu.
The acid resistance of lettuce is poor. When the soil pH of the vegetable garden in the south is less than 5, 150-200 kg of quicklime is applied per acre.
Nitrogen fertilizer is used as top dressing, according to 20%, 30% and 50% in the transplanting and returning stage, rosette stage and early stage of rapid growth, the application is applied in three times, 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.
This article URL: 2016/2017 autumn and winter lettuce scientific fertilization guidance advice lettuce fertilization skills
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