Lettuce Asteraceae, Lactuca, a biennial herb. Lettuce can be divided into two types, leaf and stem. Lettuce, also known as lettuce, and stem lettuce, also known as lettuce, fragrant bamboo shoots. Lettuce is tender and the stems can be eaten fresh, fried, fried, dried or pickled. Lettuce mainly leaves leaves or leaves, lettuce leaves and lettuce contains lettuce, bitter taste, high temperature and drought bitter taste, can enhance gastric juice, stimulate digestion, increase appetite, and has analgesic and hypnotic effects.

Cultivation Techniques. 1. Seeding: sowing should be uniform, press once after sowing, use the pedal to suppress, pouring lid feces, keeping bed soil wet before emergence. Seedlings emerged 7 to 10 days after sowing. After one week of fertilizer and water management, the distance between the seedlings was 2 to 3 cm. The stem is sown with autumn lettuce in the early autumn, when the temperature is too high to be cultivated, low temperatures should be used. The seeds were immersed in cold water for 6-7 hours and then placed in the lower layer of a household refrigerator, kept at 5-8 degrees. After 2 to 3 days, 60% of the seeds could be sown when exposed. The growth period of leafy lettuce is shorter than that of lettuce. In addition to the difficulty of cultivation in cold summer and cold season, it can be cultivated in the rest of the time. 2. Colonization: Lettuce seedling age 30 to 50 days, with 4 to 5 leaves when the true colonization. Spring stem lettuce is generally planted in November, December to next January due to low soil temperature and temperature is not easy to germinate should not be planted. Late seeding can be planted in early February. The line spacing is generally 16 to 20 cm square for early maturing varieties and 26 to 33 cm square for late maturing varieties. 3. Field management: Spring lettuce has a long growth period, low temperature after planting, and seedling growth is slow. The absorption and utilization of water and nutrients were also small. Before the planting, the water was poured once, then the fertilizer was applied once after survival, and then applied before freezing. A heavy fertilizer antifreeze. After years, top dressing should be applied to promote the growth of leafy tussocks. When the stems begin to enlarge, supply plenty of nutrients and moisture to facilitate the formation of hypertrophic stems.

Autumn lettuce is easy to convulsions in the absence of high temperature drying and fertilizer. Therefore, the management must be hard-working, hard-working, even water and fertilizer, and promote the tender stems quickly thick and fat.

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