Autumn lettuce sowing in summer, a high temperature season, seed germination is difficult, not easy to seedlings, seedlings long, flower bud differentiation early, rapid twitching. Therefore, nurturing strong seedlings and preventing immature convulsions are the key to the success of cultivation. The main points of cultivation techniques are described below: Select varieties Select heat-resistant, fast-growing, good-quality early maturing varieties, such as special heat-resistant white peel, heat-resistant white tip leaves, and Zhengxing-3. Seeding nursery: general nursery transplanting, July-September for the appropriate sowing; germination before sowing should be low temperature, vegetable farmers use frozen method, that is, after the seeds soaked for 24 hours, wrapped in gauze, in the refrigerator or freezer, in -3 °C -5 °C temperature to freeze for a day and night, and then placed in a cool place, 2-3 days to germinate; can also be used hanging method, with cold water to soak the seeds for 1-2 hours, to "floating seeds", with gauze bag Well, placed in the well 30 centimeters from the surface of the water, take out the seed for 1-2 times a day, and germinate continuously for 3-4 days; try to create a mild moist condition after sowing; set up an arbour to keep the seedbed moist; remove from the seedlings Before the membrane is planted, use 500 times 75% chlorothalonil spray every 7-10 days to prevent the occurrence of damping-off disease and epidemic disease; and use seedlings after maturity to dilute faecal water or potassium dihydrogen phosphate 0.1 % solution top dressing 1-2 times strong seedlings. Site preparation Seedling age 25-30 days, when 4-5 true leaves are planted; seedlings are too long, seedlings are easy to grow in size; mutton compost and 4000 kg of human and animal manure and 50 kg of compound fertilizer per acre, 1.2-1.5 meters wide The sorghum; row spacing 30-35 cm, plant spacing 25 cm, 6000-7000 per acre planted; with tenders listed, the density can be doubled, row spacing is 2015 centimeters. epidural catheter,Spinal and Epidural Kit,Spinal and Epidural,epidural needle,epidural kit Anesthesia Medical Co., Ltd. , https://www.jssinoanesthesia.com