The vegetables used for summer seedlings mainly include cauliflower, kale, summer cabbage, lettuce, and post-expansion peppers and tomatoes. To cultivate the strong seedlings of these vegetables, the key seedling techniques that must be carefully grasped are as follows: 1 carefully do the seedbed It is necessary to choose high dryness and flatness, the soil permeability and water retention are good, and the field of irrigation and drainage is convenient to make a seedbed, avoid continuous cropping, and it is impossible to raise seedlings in serious underground pests. The plot selected as the seedbed should be turned over half a month in advance, the base fertilizer should be applied, and the appropriate amount of fully deficient farmyard manure should be added. The soil with insufficient fertility can be added with 0.1%~0.2% compound fertilizer for shallow tillage. Mix the soil with the fertilizer evenly, make the soil fine, and build a lm wide shovel 20cm, the length of the sputum depends on the need, and the surface of the raft is leveled with a wooden board. 2 germination sowing In summer, the lettuce and the medicinal vine are difficult to germinate. The seeds should be immersed for 8 hours and then wrapped in wet gauze and placed in the refrigerator or in the refrigerator. The germination time of celery is 2~5~C48 hours, and lettuce is 5°C for 72 hours, which can promote germination and increase germination rate. Before the sowing, the bottom water should be poured. After the water seeps, spread evenly. After sowing, evenly cover the wet fine soil of 0.5-1cm thick. It is better to not see the seeds, and should not be too thick. Then sprinkle some short straw or straw on the seedbed, or cover the seedbed with a shade net, or cover the shade shelter, covered with bamboo curtains, straw curtains, etc. 3 prevention and treatment of viral diseases In the summer high temperature conditions, vegetable virus disease occurs seriously, and should focus on the selection of antiviral diseases; tomato seeds can be treated with 10% trisodium phosphate solution for 10 minutes, then rinsed with water to clear the virus and inhibit the virus; The nursery bed is covered with an insect-proof net, blocking the aphid transmission virus disease, and timely controlling the aphids. 4 to prevent the dangers of heavy rain and drought Heavy rain in summer tends to cause soil compaction, which is not conducive to seed germination. In addition to the selection of high-dry land to build a seedbed, the surrounding of the seedbed should be drained smoothly, and temporary cover measures can be used to mitigate the rainstorm hazard; when the seed is not unearthed after the planting, it will be shallowly irrigated on the seedbed after the rain to prevent the soil panel knot. The summer temperature is high and the soil evaporation is large. Care should be taken to prevent the danger of drought. The seedbed should be sown after pouring the bottom water. After sowing the soil, it should be slightly suppressed, and the insect-proof net or shade net covered by the ground will be out. Immediately after the seedlings are removed, cover the arch shed. In the morning or evening, spray water on the seedbed to prevent drought. 5 to prevent the emergence of seedlings Seedlings in high temperature season, seedlings are very easy to grow, should be sprayed with water sprayer in the morning and evening, to avoid watering at high temperature; seedlings or seedlings should be timely, so that the nutrient area of ​​the seedlings is larger. Cucumber and tomato can be sprayed with ethephon to control the growth of seedlings. Tomatoes are sprayed once with 40%-50% chlormequat 1000 times in the 5 and 7 leaf stages, which can make the seedlings thick, the leaves are dark green, the leaves are thickened, and the flower buds are promoted. 6 early prevention of pests and diseases Before sowing, the seedbed is sprayed once with 500-800 times carbendazim (can be added with insecticide). When the seedlings come out, the carbendazim 800 times solution or the thiophanate 1000 times solution plus the insecticide can be sprayed once to prevent the occurrence of various pests and diseases. Lung Function Meter Filter,Medical Spirometry Filter,Spirometry Bacterial Filter,Disposable Lung Function Meter Filter Hengshui Qifei Paper Products Co. LTD , https://www.hengshuiqifei.com