High-yield lettuce in summer

First, low temperature germination: summer lettuce growth period is high temperature season, so must use heat-resistant varieties. Before germination, first germination, soaking seeds with cold water and adding new high-fat film (improving seed germination rate) for 8-12 hours. When the water absorption rate of the seeds reaches 70% to 80%, wrap it with wet gauze and keep the temperature at 4-5 °C. After -28 hours, it is placed in a suitable temperature condition of 15-20 °C to moisturize and germination, and most of the seeds can be sown after 2-3 days.

Second, seedling transplanting: summer lettuce shoots at the end of June, early July, when seeding, the best seeds mixed with appropriate amount of dry fine soil re-broadcast, shallow sowing after the sowing, with straw curtain scaffolding shade seedling, seedling stage combined with watering After 2-3 times of dilute water manure, the seedlings can be transplanted when there are 4-5 true leaves in about 25 days. After the seedbed is watered, the seedlings are transplanted with soil, the plant spacing is 25 cm, the row spacing is 35 cm, and 700-800 plants are planted every 667 m2. After planting, the root water is poured, and the diluted water manure is poured once every 2-3 days. The new high-fat film is sprayed on the surface of the plant to prevent the infection of the bacteria, improve the ability to resist natural disasters, increase the photosynthesis intensity, and protect the seedlings. growing up. Third, fertilization and watering: summer lettuce has shallow roots, weak absorption capacity, coupled with rapid growth in summer, requiring more fertilizer and water, special attention should be paid to heavy fertilizer water management. After the seedlings are alive, the damp water manure is applied in combination with drought resistance every 3 to 5 days. When the stem begins to expand, the water is poured and the strong stems are sprayed at appropriate time, which makes the stems of the plants strong, the leaves are thick, the leaves are fresh and the plants are flourishing. The leaves were sprayed with 0.3% potassium dihydrogen phosphate 1 to 2 times. If you find downy mildew, in the early stage of the disease, spray the nail cream treatment.

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