Cultivation techniques of lettuce in winter

Date of cultivation

It can be planted in the middle of November of each year to the end of January of the second year, and harvested from mid-January to early March.

Nursery

Choose fertile sandy loam soil, and make it flat after finishing. Then, every 10 square meters, 100 kg of high-quality manure and 0.5 kg of potassium dihydrogen phosphate were applied. The mixture was thoroughly 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 in the morning without wind and sunny days, 3 to 5 grams of seeds per square meter of seedbed. After the sowing, cover a layer of fine soil 3 to 5 mm thick.

Site preparation

Before planting, 5,000 kg of decomposed organic fertilizer and 30-40 kg of compound fertilizer were applied. After deep turning, it can be made into a flat shovel, and the mulch can be made into a small sorghum.

Colonization

The greenhouse cultivation 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 plant.

Post-plant management

After planting, the daytime temperature is maintained at 20 °C ~ 24 °C, and the nighttime temperature is above 10 °C. During the slow seedling period, the soil is ploughed 1~2 times. Appropriate cooling after slow seedling, 15 °C ~ 20 °C during the day, and slowing the seedling water 7 to 10 days after the slow seedling, 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.

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