Lettuce is sweet and cool, because its stems and leaves contain lettuce, so the taste is slightly bitter, and it has the effects of clearing away heat, relieving hypnosis, lowering cholesterol, and assisting in the treatment of neurasthenia. Lettuce contains active ingredients such as mannitol, which is beneficial to urine and promotes blood circulation, clearing liver and gallbladder and nourishing the stomach. Nowadays more and more food is inseparable from the combination of lettuce, so how is the delicious lettuce grown?
Breeding seed
Choose suitable varieties according to your needs, such as glass lettuce, emperor, Caesar, head lettuce, mosaic lettuce, Great Lakes 659, etc.
Preparing seedbed
Lettuce seedlings should use water-preserving, fertile and fertile sandy loam. Bed soil preparation: 10 square meters of seedbed with decomposed organic fertilizer 10 kg, ammonium sulfate 0.3 kg, superphosphate 0.5 kg, potassium sulfate 0.2 kg, fully mixed evenly and finely, pouring the bottom water, water seepage and sowing.
Sowing seedling
In order to spread evenly, a small amount of fine sand can be mixed into the seed during sowing, and 0.3-0.5 cm thick tidal soil is covered after sowing, and the mulch is covered and moisturized. The seeding rate per acre is 30-50 grams. When the seedlings begin to be unearthed, the mulch film should be uncovered in time to prevent the lengthening. The temperature of the seedbed is controlled at 18 °C - 20 °C during the day and 12 °C - 14 °C during the night. Pay attention to ventilation and ventilation. If it is exposed to strong light, it needs to be shaded. When the seedlings grow to 2-3 true leaves, the seedlings are divided into 6-8 cm seedlings, and when they grow to 4-5 true leaves, they can be planted. In order to prevent seedling disease, you can spray 600 times 75% chlorothalonil liquid 1-2 times.
Scientific fertilization
Lettuce requires clay loam rich in organic matter, water retention and fertility. Lettuce is slightly acidic, and the pH value of soil is 5-7. For the production of 1000 kg of lettuce, it is necessary to absorb 2.5 kg of nitrogen, 1.2 kg of phosphorus and 4.5 kg of potassium. Among them, the lettuce needs more potassium. The growth period requires the use of nitrogen, phosphorus and potassium fertilizers. The plots of lettuce should be deeply cultivated, and the base fertilizer should be applied before planting. The farmland fertilizer should be 3000-3500 kg. After deep application, the bottom water should be poured and the dry water should be poured.
Careful planting
The seedling bed was flooded one day before planting to make the nursery wet. The next day, the seedlings should be soiled as much as possible to reduce root damage. When planting, first ditch in the surface of the shovel, the depth of the ditch is 4-6 cm, and the line of 70 cm is planted 3 rows. After ditching, the ternary compound fertilizer is applied to 25 kg per mu and then water is poured. After the water seepage, the plant spacing is 24 cm. Miao Pei soil seals the ditch, flattening the surface, covering the plastic film, and introducing the seedlings out of the film.
Post-plant management
Lettuce is wet, and there is ample water supply during the whole growth period. After 5-7 days of planting, the seedling water is poured once. The plots that did not cover the mulch after pouring the seedlings were irrigated twice for weeding. After pouring 3-4 times of water, combined with the watering period, topdressing nitrogen and phosphate fertilizer, 15-20 kg per mu. Stop watering before harvesting for storage.
Scientific harvesting
Non-ball lettuce can be harvested at the market price. It is better to harvest the lettuce after the leaves are tight, and the yield will be affected too early. If the leaves are too late, the stems will be elongated and the quality of the leaves will be loose.
Winter warm greenhouse lettuce cultivation
Winter broccoli should first be selected from varieties with wide applicability and strong cold tolerance, sowed in pre-prepared seedbeds, and also in seedlings. The seeding amount of 20-25 grams of seeds per mu.
1. Preparation before sowing: The broccoli can be seeded or floated in a seedbed. The substrate and nutrient solution of floating seedlings are the same as those of flue-cured tobacco seedlings; seedlings for seedling bed breeding should be selected for easy irrigation and drainage of loam, and the width of 1.-1.8 m (groove) and 20-25 cm high seedling bed, per square foot The rice seedling bed is applied with 10-15 kg of organic fertilizer and a certain amount of phosphorus and potassium fertilizer. After the application, the soil will be mixed, chopped and leveled, and the general manager will be sprayed and disinfected to reduce the source of the bacteria.
2, sowing: seedling seedlings, pre-mix the seeds with a certain amount of fine sand and then sow, 4-5 grams per square meter of seeding (that is, 5 square meters of seedlings can be planted in an acre field), covered 0.5 after sowing ―1cm thin soil, spraying new high-fat film 800 times liquid (spraying new high-fat film 800 times liquid protection, water-proof evaporation, sun-proof and drought-resistant, heat preservation and anti-freezing, anti-soil layering, suffocation and isolation of pests and diseases, and increase the emergence rate. ), then cover with a thin layer of straw. In the late summer and early autumn, it is hot and rainy. Whether it is floating seedlings or seedbed seedlings, it should be covered with a sunshade net to protect it from rain.
3, seedling management after sowing: after sowing should pay attention to water, often keep the soil moist, seedlings seedlings about 3 days can be seedlings, timely release the straw. In summer, seedlings should pay special attention to the prevention and control of yellow stripe and cabbage caterpillars. Remove the shading net 7-10 days before transplanting, so that the seedlings can fully see the light. After 30 days of sowing, the seedlings are about 15 cm high and can be colonized with 5-6 true leaves. Spraying insecticidal and bactericidal agents on the seedbed before planting, and spraying the new high-fat film 800 times liquid in time to prevent the moisture on the ground from evaporating, the moisture of the seedlings is not transpiration, the pests and diseases are isolated, the seedling period is shortened, and the new seedlings are quickly adapted. Environment, healthy growth.
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