1, growth characteristics

Lettuce does not like high-temperature environments, but also not hardy, the optimal growth temperature of 15 to 20 degrees, the land pH value of 5.8 to 6.6 is most suitable.

2, sowing time

Lettuce sowing time is very long, can be the year of August to the next February, the most suitable time for sowing is the middle of October to the middle of December, of course, early March to early July can also be sown, but the yield may not be high.

3, seed germination

High-temperature season planting lettuce must also give the seeds for low-temperature germination, first of all, you can soak in well water for six hours or so, scrub clean and then fetch with a wet gauze wrapped in a good, placed in 15 to 18 degrees Celsius under the environment of the germination, but also can be hung in the well germination.

4, seedling transplantation

Before sowing lettuce, the seedbed should be watered first, and then the seeds and an equal amount of wet fine sand stirred evenly after sowing. In winter and spring greenhouse planting or open field cultivation, it is necessary to pay attention to maintain the temperature of the seedbed.

5, scientific fertilization

Lettuce planting soil requirements, rich in organic matter, and fertilizer and water retention capacity of the clay loam, basically every lettuce one thousand kilograms of lettuce, you need to absorb nitrogen fertilizer 2.5 kilograms of phosphorus fertilizer 2.4 pounds of potash 9 pounds.

6, careful planting

Planting time must be careful, first of all, the day before the seedbed irrigation, the next day when the seedling with a little more soil. When planting, the first in the bed to open a good ditch, ditch depth of 4 to 6cm.

Lettuce varieties to choose

1, ball lettuce

Ball lettuce is mainly characterized by the formation of terminal leaves leaf ball, the leaf blade is entire, serrated or y cleft, the surface of the leaf smooth or crumpled, the terminal leaves to form a ball of leaves, rounded or biased rounded, the main varieties of the Great Lakes 659, avant-garde 75, Salinas, North Mountain three, Mamik, Bilu, etc..

2, wrinkled leaf lettuce

Wrinkled leaf lettuce is mainly characterized by not ball, basal leaves, leaf blade long ovoid, petiole longer, leaf margin undulate notched or y cleft, leaf surface crumpled, clustered leaf clusters have a large flower, the main varieties of purple leaf lettuce, red sail, safflower leaf lettuce, green wave, Dongshan lettuce, and so on. The main varieties are "red sail" purple leaf lettuce, red flower leaf lettuce, green wave, Dongshan lettuce, etc.

3, upright lettuce

The main feature of upright lettuce is that the leaf blade is narrow and long, upright growth, leaf entire edge or serrated, leaf blade thick, thick flesh, flavor is poor, less varieties, distribution area is not wide, in the domestic planting is rare.

Expanded Information:

The value of lettuce

1, medicinal value

Lettuce nature of the sweet and cool, because of its stems and leaves contain lettuce pigment, so the taste is slightly bitter, there is a heat and refreshing, analgesic hypnotic, lower cholesterol, assist in the treatment of neurasthenia and other effects. Lettuce contains mannitol and other effective components, diuretic and promote blood circulation, clear the liver and gallbladder and stomach effects.

2, health value

Lettuce contains interferon inducer, can stimulate the body's normal cell production of interferon, resistance to viruses, improve the body's immunity. Lettuce contains a substance called protocatechuic acid, which has a significant inhibitory effect on cancer cells, especially in resisting gastric cancer, liver cancer, colorectal cancer and other digestive system cancers, the effect is remarkable.

Vitamin E and carotene in lettuce can protect the eyes, maintain normal vision, and relieve dry and tired eyes. Lettuce is rich in vitamin C, with a little whitening effect. Lettuce in the dietary fiber and other nutrients are very high, often eaten with the role of eliminating excess fat, so lettuce and weight loss lettuce reputation.

3, food value

Lettuce is rich in nutrients, containing a large number of beta carotene, antioxidants, vitamin B1, B6, vitamin E, vitamin C, and a large number of dietary fiber and trace elements such as magnesium, phosphorus, calcium, and a small amount of iron, copper, zinc. Enhance the digestion and absorption of protein and fat, improve blood circulation in the stomach and intestines can often eat lettuce.

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