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First, choose a good seed: greenhouse cultivation early spring lettuce should choose cold-resistant sharp-leaf early maturing varieties, such as Hefei Jianye duck lettuce and Beijing carp lettuce. Second, nurturing strong seedlings: In late January in the greenhouse sowing seedlings. Before sowing, soak the seeds with fresh water of 20°C for 3-4 hours. After washing, remove the controlled dry water and put them into gauze bags. Place them under a temperature of 20°C to germinate. Wash with water once a day, control the dry water and continue germination, 2-3 days buds can be sown. The seedbed is to be filled with fertile sandy soil land, with 0.1 kg of diammonium phosphate and 0.1 kg of potassium dihydrogen phosphate per square meter of seedbed, and then plowed 10-12 cm deep. The seedlings are solid, and the water is poured. - 0.2 cm thick fine sand, followed by sowing, sowing after the cover 0.5-1 cm thick. About 1 gram per square meter of seedbed is used, and 20-25 square meters of seedbed per mu of field is required. Keep bed temperature 20-25°C after sowing, and raise seedlings 3-5 days. After emergence, the temperature is controlled at 18-20°C during the day and 8-10°C at night. When the seedling grows to 2 leaves and 1 heart, the seedlings are 3-5 cm apart. Seedling spray 2-3 times 75% Chlorothalonil 600-800 times liquid to prevent seedling disease. The seedling age is about 30 days and 4-5 true leaves are planted. Third, the seedbed temperature: daytime control at 22-25 °C, night 12-14 °C. Cover soil: When the seedbed cracks, it should be promptly filled with moist fine soil to prevent cotyledons "cap" unearthed to facilitate the formation of lateral roots embryonic axis parts. The seedlings: The split seedlings were divided twice. After the first time, the weak seedlings and cotyledons were incomplete and the young seedlings with weak growth were eliminated. The second time the first true leaves were unfolded, the seedlings were kept at a standard of 3 cm in length. True leaf temperature: After the first leaf of the pepper seedlings enters the normal management, the seedbed temperature is controlled at 25-30°C during the day and 14-18°C at night. The temperature of the seed bed at night should not be too high, so as not to cause the plants to grow. Sub-seedling: When the seedlings have 2-3 true leaves, they enter the early stage of flower bud differentiation. If they are not separated in time, they can easily cause leggy and delay flower bud differentiation. Maintaining proper temperature and humidity after seedlings accelerates wound healing in the root system. Due to the poor regenerative ability of the color pepper roots, it is best to split the seedlings only once.