For the variety selection, we should choose the mid-late ripening lettuce varieties with strong cold resistance for cultivation.
Cultivation date The greenhouse cultivation can be planted from the middle of November to the end of January of the next year, and harvested from mid-January to early March.
The seedlings are selected from fertile sandy loam soil, and they are made into flat rafts after being thinned. Then, every 10 square meters, 100 kg of high-quality manure and 0.5 kg of potassium dihydrogen phosphate were applied, fully mixed, and the surface was leveled and watered. After the water was infiltrated, the seeds were seeded. Generally, dry seed sowing is used, and seeding can be carried out after soaking seeds and germination. Dry seeds are first seeded with 75% chlorothalonil wettable powder equivalent to 0.3% of the seed weight, but it should not be placed for too long. Soaking seeds and germination should be soaked in warm water at 20 °C for 6-7 hours. After being taken out, wrap it in a cloth bag, germination at 20 °C, rinse once a day with water, and buds after 2~3 days. Seeding was carried out in the morning without wind and sunny days, and 3 to 5 grams of seeds were planted per square meter of seedbed. After the sowing, cover a layer of fine soil 3 to 5 mm thick.
Before the application of soil preparation and fertilization, the application of 5,000 kg of organic fertilizer and 30-40 kg of compound fertilizer will be applied. After deep turning, it can be made into a flat shovel, and the mulch can be made into a small sorghum.
Planting in greenhouses is generally 40 cm in length and 30 cm in plant spacing. Watering and cutting before seedlings, with more soil. Ditch or dig a hole to plant, seal the ditch and pour the water to settle the planting water.
After planting, the daytime temperature after planting is maintained at 20 °C ~ 24 °C, and the night temperature is above 10 °C. During the slow seedling period, the soil is ploughed 1~2 times. Appropriate cooling after slow seedlings, 15 ° C ~ 20 ° C during the day is appropriate, and 7 to 10 days after the slow seedlings to slow down the seedling water, while applying light fertilizer, about 10 kg per acre. Then cultivate again and properly seedling. About 15 days later, when the rosette leaves have grown, and the heart leaves begin to wrap, apply compound fertilizer or ammonium nitrate 15~20 kg, and then topdress the fertilizer once. The number of watering in winter should not be too much to prevent the ground temperature or humidity from being too high. When entering the ball-forming stage, the water supply should be even, and should not be wet or dry, so as not to crack the ball or open the ball. Stop watering 3 to 5 days before harvesting.
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