(2) Soft-tailed lettuce. Also known as glass lettuce, it was originally a local variety in southern China. The spreading degree is 27 cm, the leaves are nearly round, thin, yellow-green, wavy, wrinkled and semi-upright. The growth period is 55 days, which is cold-resistant, heat-resistant and easy to bolting. Suitable for open cultivation in spring and autumn, because of its short growth period, in order to increase the variety of vegetables, interplanting and interplanting in protected areas can also be used. Open field cultivation in spring is sown in early March, planted in early and middle April, and harvested from middle and late May to early June. The yield per 667 m2 can reach1000 ~ 2000 kg.
(3) "Red Sail" purple leaf lettuce. Purple-leaf lettuce varieties introduced from the United States have large plants, loose leaves, wrinkled leaves and beautiful colors. As the harvest period approaches, the red color gradually deepens and it is not easy to bolting. Light-loving, heat-resistant, early maturity. The growth period is 45 days, and the yield per 667 m2 can reach1000 ~ 2000 kg.
(4) American fast-growing students. Introduced by the United States. The plant grows closely, the leaves are wrinkled, the leaves are wavy, the leaves are light green and the taste is excellent. The growth period is 45 days, which is resistant to leaf scorch, wide adaptability and strong cold tolerance, and can be produced all year round. It is an ideal variety for protected cultivation and open field production in winter and spring.
(5) Italy is resistant to bolting lettuce all year round. Introduced from Italy, it has remarkable excellent characters. Good purity, beautiful plant shape, crisp taste and good quality. Outstanding advantages are heat resistance, cold resistance and bolting resistance. It can be planted all year round, and can grow normally in the hottest summer (May-August), while maintaining good quality without bitterness. The continuous harvesting time is long, and the yield is high, and the yield can reach more than 2000 kg per 667 m2. Anti-bacterial nucleosis, leaf scorch, etc., and will not rot in rainy seasons in spring and summer.
(6) erect lettuce. The leaves are all-round, long and narrow, grow upright, do not bear balls or roll in a barrel shape, and the leaves are dark green or yellow-green, crisp and tender. The seeds are black and grayish white.
(7) the emperor. Middle-early maturing varieties introduced from the United States are heat-resistant and disease-resistant, and have strong adaptability. It is mainly suitable for shading cultivation in summer, and can also be cultivated in open field in spring and autumn and protected field in winter and spring. The outer leaves of the plant are small, turquoise, wrinkled, dentate at the leaf margin, medium-sized bulb, compact and flat at the top. The single ball weighs 500 grams, is crisp, tender and refreshing, and has excellent quality. The growth period is 85 days. Because of its strong heat resistance, this variety can be cultivated in summer in protected areas for shade and rain protection. Sowing in early April to late June; Planting in early May to late July; Harvest from late June to early and middle September. Plant spacing is 30 cm square. 6000 ~ 7000 plants are planted every 667 meters, and the output is about 3500 kg.
(8) Olympia A very early-maturing lettuce variety introduced from Japan has a growth period of about 80 days. The leaves are light green, with more notches on the leaf margin and smaller outer leaves; The leaf ball is light green, slightly yellow and compact, and the single ball weighs 400 ~ 500 grams. Good quality and good taste. Strong heat resistance, bolting very late. It is suitable for open cultivation in spring and autumn, especially in summer, and can be used as a special variety of lettuce in summer.
(9) Lin Nasi. The middle and early maturing varieties introduced from the United States are resistant to heat, downy mildew and top scorch, and are suitable for shading cultivation in spring and autumn protected areas, open fields and summer. The plant grows vigorously and neatly, with few outer leaves, inward, dark green and small notch on the leaf edge; The leaf ball is round, green and white, compact, with an average ball weight of 500 grams, good appearance and excellent quality. The plant spacing is 30 cm square, and 6000 ~ 7000 plants are planted every 667 meters, with a yield of 3000 ~ 3500 kg. The mature period is neat, and it is more resistant to transportation. The growth period is 85 days, and it takes about 50 days from planting to harvesting.
(10) Queen. The middle-early maturing variety introduced from the United States is slightly heat-resistant, bolting late, resistant to lettuce mosaic virus and top burning disease, and suitable for open cultivation in spring and autumn. The plant grows neatly, the leaves are medium-sized, dark green, and the leaves are notched; The leaf ball is oblate, compact, light green, with an average weight of 550g, fine and crisp texture and good flavor. The plant spacing is 30 cm square, and 6000 ~ 7000 plants are planted every 667 meters. The growth period is 85 days, and it takes about 50 days from planting to harvesting, and the yield is 3000 ~ 3500 kg.