Lettuce planting technology:

1, choose good seed. The early fall temperature is high, need to use special heat-resistant varieties, can choose the Sichuan special heat-resistant two white skin, welcome summer round leaf and Shanghai's medium maturity pointed round leaf varieties, these varieties in the 35-38 ℃ under the conditions of good growth, is not easy to moss.

2, appropriate early sowing. Shanghai autumn lettuce sowing period is generally in August 5-20, when the climatic conditions of lettuce growth is more favorable, lettuce easy to grow thick, yield is also high, can be appropriate early sowing, generally can be sown at the end of July seedlings.

3, low-temperature germination, cultivate strong seedlings. late July the temperature is higher than 30 ℃, the seeds can not germinate without low-temperature treatment, so in the sowing of seeds before the low-temperature germination, the seeds can be soaked in water for 4-5 hours after the pick up, wrapped in gauze bags placed in a refrigerator freezer, the temperature should be controlled at 5-8 ℃, the temperature of the refrigerator, the temperature should be controlled at 5-8 ℃, the temperature should be controlled at 5-8 ℃, the temperature should be controlled at 5-8 ℃, the temperature of the refrigerator. After 24 hours take out and wash with water and then put in again, after 48 hours can be sown after dew white. Seed bed should be leveled and cut fine, appropriate thin sowing, 50 grams of seed can be sown 30 square meters.

4, timely planting reasonable dense planting. Early fall lettuce seedling order should not be too long, generally in 25-30 days, otherwise it is easy to cause the stem of the stem aging, affecting the growth of the stem. Lettuce needs fertilizer and water, to choose flat terrain, fertile fields, combined with ploughing, 60 kg of compound fertilizer per acre, 25 kg of ammonium bicarbonate, deep ditch and high beds, selected cloudy day planting.

5, fertilizer promotion. Early autumn lettuce to get high yield is the key to water enough fertilizer. Live after the application of a seedling fertilizer to promote seedling growth, when the leaves from upright to spreading, into the rosette period of growth, combined with watering reapplication of open disk fertilizer, mu of urea 20 kg, closed line combined with watering again hole urea 20 kg, to promote the expansion of the plant to carry out the degree of fleshy stems on the long thick. In drought conditions early moss, so water frequently.

6, harvesting. When the lettuce main stem tip and the tip of the highest leaf level can be harvested, at this time the young stem long enough, the texture is crisp and tender, the quality is good, remove the old leaves, tied into a small net vegetables on the market, the mu yield of 1,000-1,500 kilograms. p>The medicinal value of lettuce:

1, diuretic breast: lettuce potassium content is much higher than the sodium content, is conducive to the body's water-electrolyte balance, to promote urination and milk secretion. For high blood pressure, edema, heart disease people have certain therapeutic effects.

1, open the sparing, eliminate accumulation of gas: lettuce taste fresh and slightly bitter, can stimulate the secretion of digestive enzymes, enhance appetite. Its milky pulp can enhance the secretion of gastric juice, digestive glands and bile, thus promoting the function of each digestive organ.

3, strong body, anti-cancer: lettuce contains a variety of vitamins and minerals, has the role of regulating the function of the nervous system, lettuce hot water extract of certain cancer cells have a high inhibition rate, so it can be used to prevent cancer and anti-cancer.

4, wide bowel laxative: lettuce contains a large amount of plant fiber, can promote peristalsis of the intestinal wall, fluent digestive tract, to help stool excretion, can be used to treat a variety of constipation.

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