In order to regulate the supply of vegetables in off-season, in recent years, some places have explored a new technology for summer planting lettuce. The output per 667 m2 can reach 1200 kg and the economic benefits are significant. The specific approach is as follows. Cold germination. Summer lettuce growth period is at a high temperature season, so heat-resistant varieties must be selected. Pregerminate before sowing, soaking in cold water for 8-12 hours. When the seed water absorption reaches 70% to 80%, wrap it in a wet gauze, place it in the freezer or hang it in the well 10 centimeters away from the water, keep 4-5 °C low temperature, 24-28 hours after treatment, placed at 15-20 °C suitable temperature moisturizing germination (not through the seed of the dormant sun drying can increase the germination rate), after 2-3 days most seeds can be sown when exposed . Shade breeding. Summer lettuce is sown at the end of June and early July. When sowing, the best seeds are mixed with appropriate amount of dry fine soil and then sowed. Each gram of seeds is sown in an area of ​​1 m2. The seedlings are sowed with dry water and planted. After sowing, the shoots are picked up and the straw is used. Shelf shade shading nursery, sunny early cover late exposing, cloudy open all day, in order to cool and moisturize. During the seedling stage, combine watering topdressing 2-3 times with dilute manure, and when the seedling age is about 25 days, there are 4-5 true leaves that can be transplanted. Transplanting method. Before planting, every 667m 2 will be treated with 3,000kg of manure, 2000kg of manure and livestock excrement, and the site will be dug and ditched. The surface will be leveled and the width will be 1.5-2m. The ditch will be 25cm wide and 15-20cm deep. In late July, sunny evenings were selected. After the seedbeds were watered, they were transplanted with soil, and the spacing was 25 centimeters, the spacing was 35 centimeters, and 700-800 plants were planted per 667 meters. Pour enough water after planting, dilute water manure every 2-3 days. It is best to scaffolding and shade before living. Fertilize and water. Summer lettuce roots are shallow and their absorption capacity is weak. In addition, they grow rapidly in the summer and require more fertilizer and water. Special attention should be paid to heavy fertilizer water management. After the seedlings are kept alive, every 3 to 5 days are combined with drought-resistance and top dressing. When the stem began to grow, it was time to pour fertilizer (stop pouring 10 days before harvest) and spray 0.3% potassium dihydrogen phosphate one or two times. If downy mildew is detected, it may be used to prevent metal downy mildew in the early stage of the disease. Where conditions permit, when the lettuce ridges and stems begin to hypertrophy, spraying acetylsaccharin regulators 2 to 3 times can effectively increase the stem weight. Batch harvested. Late summer lettuce harvesting, fleshy stems can form buds, consume nutrients, hollow, can not eat. Collecting too early will reduce production. Generally about a month after transplanting, when the stems are swollen and the tips of the stem and outer leaves are at the same height, they can be harvested in batches.
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