High-temperature breeding seedlings technology has six
Some vegetables are not only prone to poor growth during the summer hot season, but also susceptible to various diseases and pests. Therefore, it is necessary to carry out nursery cultivation such as cauliflower, cabbage, celery, Chinese cabbage, cabbage lettuce and greenhouse tomato planted in the autumn. Wait. Six key points for raising seedlings are introduced here for reference by farmers. Choose land parcels: After the land is well-chosen, a fully decomposed farmyard manure should be added as a base fertilizer and shallow ploughed after fertilization. The plots for raising seedlings should be high and dry, have good soil permeability and water retention capacity, and be capable of irrigation and drainage, and should not be used for growing seedlings of the same vegetables to prevent soil-borne diseases. In addition, it should also be remembered not to raise seedlings on the land with severe pests in the ground. Germination treatment: The seeds of lettuce and celery are difficult to germinate, and germination is performed before sowing to increase the germination rate. For lettuce and celery seeds, they should be soaked in water for 8 hours, then wrapped in wet sand and placed in a well or cold place. Celery seeds can be kept at a low temperature of 2°C-5°C for 48 hours. The lettuce seeds can be kept at a low temperature of 5°C for 72 hours. To prevent high-temperature hazards, sprinkle some wheat straw or straw on the seedbed during seedling raising, or cover the seedbed with a shade net, or set up shade canopies to cover old films, non-woven fabrics, bamboo curtains, draperies, etc., or on tall crops. Under the nursery. Prevention of viral diseases: Severe vegetable virus disease occurs at high temperatures and various measures should be taken to prevent it. Aphids are the major mediators of viral diseases, and special attention should be paid to the control of aphids in the nursery process. Generally, nylon nets can be used to cover seedbeds to prevent locusts from migrating, or to use silver-gray membranes to avoid radon. In addition, in the cultivation, we should try our best to choose vegetable varieties resistant to viral diseases. Mustard and tomato seeds are best soaked in 10% trisodium phosphate solution for 10 minutes before sowing, then rinse with clean water, or inoculate tomatoes with attenuated vaccine. Anti-rainstorm hazards: Summer temperatures are high and heavy rains, the soil is easy to build, is not conducive to seed germination and unearthed. Therefore, in the nursery should be selected to build a high dry seedbed, areas with more rainstorm should choose to grow seedlings in sandy soil, seedlings around to be smooth. And use temporary coverage. After sowing, in case of heavy rain, the sprouts will be difficult to unearth. After the rain, the seedlings should be ploughed in time to prevent surface compaction. Anti-arid: When the soil is dry, after constructing the seedbed, it should be poured with bottom water and then sowed, or it can be fully irrigated and then settling the bed, and then sowing, sowing, covering the earth and repressing, covering the film, pay attention to The film should be removed immediately after emergence. In addition, water the seedbed every morning or evening. When the weather is dry, it can be planted by seedlings, that is, seedlings can be planted on the spot by opening the seeding hole. After the first hole is sown, it will not cover the soil. When the second hole is dug, the wet soil excavated from the hole will be used as the cover of the first hole. Prevention of leggy: In the summer when young seedlings are cultivated, the seedlings are prone to prolonged growth due to high temperatures, so preventive measures must be taken. Can be sprayed with a watering can every morning and evening, seedlings grow or seedlings in time after the seedlings grow up, so that the nutritional area to expand more. For cucumber and tomato seedlings, ethephon can be sprayed in time when it is found to be long. Tomato seedlings can be sprayed once every 40% of chlormequat in 1,000-fold liquid to grow in 5-leaves and 7-leaves to promote the growth of seedling stems and promote flower bud differentiation.