Lettuce cultivation in greenhouse

Cultivation Techniques

1. Nursery

(1) Soaking Seeds and Promoting Bud

Soak the seeds in warm water for 4 to 5 hours. Then place at 15-20 Â°C. See light germination for 2 to 3 days. The young shoots can be sown by breaking through the seed coat. About 667 square meters requires about 200 grams of seeds.

(2) sowing seedlings

The nursery soil is loose. Rich in organic matter. After the seedling tray is loaded with the seedling soil, the bottom water is poured. Do not oversize the water. The freshly irrigated is used, and then the germinated seeds are spread on the seedling tray. Appropriate dilution. To prevent excessive density, plant about 5 to 10 kilograms per square meter, be careful when planting. Do not hurt the sprouts. Cover soil 0.5 cm after sowing. Not too thick. Cover with a film to moisturize. Placed at 20 to 25 Â° C. After about 5 to 6 days of seed supply, the film was removed in time. After emergence, the daytime temperature is 18-22 Â°C, and the nighttime temperature is 10-12 Â°C.

(3) Simple plastic plate seedlings

About 25 days after sowing, when the seedling grows to 2 leaves and 1 heart. Use a hundred holes to simplify the seedlings. The lettuce seedlings are transplanted into a 100-well simple plastic tray and then watered. The nutrient soil in the simple plastic plate requires loose and fertile, rich in organic matter. Eli seedlings grow robustly. After seedlings, the temperature is 20 ~ 25 Â° C during the day, 15 ~ 20 Â° C during the night, to promote the support of the seedlings, after about 3 to 5 days slow seedlings, the temperature is controlled at 18 ~ 22 Â° C during the day; 12 ~ 14 Â° C at night is appropriate. After the seedlings. Spray double-effect micro-fertilizer. Foliar fertilizer such as Shibao is used to promote leaf growth and spray once every 7 days. Spray about 2 to 3 times. The nutrient soil in the simple plastic tray is kept dry and wet. After about 3 days, the lettuce grows to 4 to 5 leaves. Prepare for colonization. Cooling the seedlings 1 week before planting. Spray chlorothalonil, or chlorpyrifos, or agricultural streptomycin and foliar fertilizer before planting to facilitate post-planting and prevent disease.

2. Planting

Land preparation, 667 square meters of fermented organic fertilizer 5000 ~ 10000 kg, Pu Shi lime 80 kg. Can be sterilized. It can also adjust soil acidity and increase calcium. Prevent calcium deficiency and top burning. Lime can be applied once every 2 to 3 years; it is made into a 55 cm wide sorghum, and the sorghum is planted with double rows of lettuce. Conditional covering the mulch. It can prevent disease and harvest it in a week or so. At the time of planting, the diammonium phosphate was applied at 40 kg per 667 square meters; the row spacing of the plants was 15 cm Ã— 20 cm. Watering the planted water. Until harvest, avoid flooding to avoid rot. When the soil is too dry, water can be sprayed.

3. Management of after planting

Before planting, support the seedlings. The temperature during the day is 25~30Â°C, and the nighttime is 12ï½ž20Â°C, which promotes the slow seedling; The daytime temperature is 15-20 Â°C, the nighttime is 8-10 Â°C, about 3 to 4 days of seedlings; the daytime temperature is 18-22 Â°C, and the nighttime temperature is 8-12 Â°C. When the temperature is too high, the heart leaves are easy to be necrotic and rotten. The plant is dry and wet depending on the soil for about 5 days. A small slow seedling water can be poured as appropriate. After the soil is dry. Timely cultivating loose soil, increasing soil permeability, accelerating the growth and development of lettuce, increasing leaf spray fertilizer during the growing season, and accelerating leaf growth. Spray once every 7 days. Spray a total of 3 to 5 times. It is better to use double-effect micro-fertilizer, spray Shibao, and potassium dihydrogen phosphate. At the same time, the mixed spray fungicide chlorothalonil, chlorpyrifos, agricultural streptomycin, can be killed. Prevention and treatment of lettuce rot, gray mold, downy mildew and so on. The fungicide should be sprayed alternately. In order to accelerate the growth of the leaves, 10 to 20 mg/kg of gibberellin is sprayed at 10 to 15 leaves, and the gibberellin is first dissolved with alcohol. Add water spray. In the winter greenhouse, ventilation is poor. Less carbon dioxide. Conditional can increase the application of carbon dioxide gas fertilizer to promote growth, lettuce is a long-day plant, requires sufficient sunshine, lettuce can grow robustly. Therefore, the cover of the greenhouse should be exposed early, increase the light and promote growth.

4. Harvest

About 50 days after planting, watch the market harvest at the right time.

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