1. Select good varieties of lettuce varieties that are resistant to disease and cold resistance, such as “two green skins†and “three green skinsâ€.
2, timely nursery seedlings in late September to early October sowing. Because the lettuce seeds are very small, the seedbed must be intensively cultivated, and the seedbeds should be irrigated one day before sowing in order to facilitate the emergence and growth of the seedlings. About 50 grams per mu are planted. After sowing, a thin layer of nutrient soil or a broom will be used to swipe the surface of the planter to cover most of the seeds. Then cover the shading nets on the surface to moisturize the seedlings, timely remove the shading nets after emergence, and withdraw some nutritious soil from the shabu shabu to avoid excessive exposure of the seedling roots. Pay attention to drought relief during the nursery.
3, timely planting before planting plastic film covering the top of the greenhouse. The lettuce needs a large amount of fertilizer, and 3,500 kilograms of decomposed organic fertilizer is used as base fertilizer in the 20 days before planting. Due to the weak root system of lettuce, planting areas should be intensively cultivated to distribute fertilizer and mud evenly. The seedling age is 30 to 35 days, and when the seedlings have 5 to 6 leaves, it is suitable for planting. When raising seedlings, seedlings should have more dirt and less root damage. The planting spacing is 3025 cm and the density is 6000 to 7000 per mu. Pouring enough water after planting to promote slow seedlings.
4, greenhouse management 1 fertilizer water management. After planting slow seedlings, topdressing 1 thin fertilizer and water, applying 5 kg of urea per acre, combined with watering, in order to benefit roots and leaves. After the plants were sealed and applied for the second fertilizer, 15 kg of urea and 15 kg of calcium, magnesium and phosphate fertilizers were applied to promote the expansion of meat stems. 2 temperature and humidity control. In the first half of November, skirts and membranes were fashioned around the greenhouses and during the day. Membrane ventilation was removed during the day, the control temperature was about 25°C, and the night temperature was kept at about 15°C. It was necessary to ensure that the lettuce grows robustly and that the temperature and humidity in the shed are appropriately reduced. , control the occurrence of diseases. Before the onset of winter, it is necessary to appropriately reduce the greenhouse temperature, exercise plants, and do a good job of freezing and keeping warm to facilitate safe wintering.
5, pay attention to disease prevention greenhouse early spring lettuce during planting, mainly should pay attention to the prevention and control of downy mildew, sclerotia, gray mold, soft rot and other diseases, and in the early stages of disease, alternating spraying chlorothalonil, A Chitobuzu, sclerotia net, quick gram and other pesticides.
6, timely harvest When the lettuce plants grow to the heart and leaves flush with the best harvest time, can be harvested market.
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