Winter cultivation techniques of lettuce
Variety selection should be selected for late-maturing mid-late-maturing cabbage lettuce varieties for cultivation. Cultivation date Sunlight greenhouse cultivation can be planted from mid-late November to late January, and harvested from mid-January to early March. Seedlings choose fertile sandy loam soil, made it flat and finished. Then every 10 square meters of high-quality manure applied sieved 100 kilograms, potassium dihydrogen phosphate 0.5 kilograms, fully mixed, after the leveling surface watering, water infiltration after seeding. Dry seeds are generally used for sowing, but they can also be sowed after germination. Dry seeds are sown with 75% chlorothalonil wettable powder at a seed weight of 0.3%, but should not be allowed to stand for too long. Immersion germination, should be soaked in warm water 20 °C 6 ~ 7 hours, remove and wrap it in a cloth bag, placed under 20 °C germination, washed with water once a day, 2 ~ 3 days after the buds. Select sowing on a sunny day without wind, broadcast 3~5g seed per square meter of seedbed. After sowing, it is covered with a layer of 3 to 5 mm thick fine soil. Before the site preparation and fertilization, 5000 mu of composted organic fertilizer and 30–40 kg of compound fertilizer were planted. After the deep plowing, it is made into a flat bark, and the plastic film can be covered with a small puppet. Planted in a greenhouse, the general spacing is 40 centimeters, and the spacing is 30 centimeters. Before the seedlings are planted, they are watered and chopped, adding more soil. Open ditch or dig planting, seal ditch flat water after planting water. After planting, the daytime temperature was kept at 20°C~24°C and the nighttime temperature was above 10°C. During the period of easing, cultivating loose soil 1~2 times. Appropriate cooling after easing the seedlings, during the day with 15 °C ~ 20 °C is appropriate, and in the 7 ~ 10 days after the slow emergence of seedlings watering, while light application of chemical fertilizer, applied per acre about 10 kg. Afterwards, cultivating again and seedlings appropriately. After about 15 days, when the rosette leaves have grown up and the heart leaves start to pack, 15 to 20 kg of compound fertilizer or ammonium nitrate is applied, and the fertilizer is topdressed once during the ball stage. The number of times of watering in winter should not be too much to prevent the ground temperature or humidity from being too high. When entering the ball stage, the water supply should be uniform. Do not dry or damp, so as to avoid cracking the ball or opening the ball. Stop watering 3 to 5 days before harvesting.
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