High temperature season vegetable seedling technology

Some vegetables grow poorly during live broadcast in the summer hot season, and are also susceptible to pests and diseases, so they must be cultivated. The vegetables grown in the hot season in summer are mainly broccoli, broccoli, celery, Chinese cabbage, lettuce, and tomatoes grown in greenhouses.

one. Choose the land: choose soil permeability and water retention, and can fill the energy. Avoid continuous cropping, so as to avoid soil-borne diseases, and avoid the serious pests of underground pests. After selecting the plots, the fully-fertilized farmyard manure should be added as the base fertilizer.

two. Prevention of high temperature hazard: lettuce and celery are difficult to germinate at high temperature. Seeds can be soaked for 8 hours and then wrapped in wet gauze for germination in a well or in a cool place. Or low temperature treatment, celery is 2-5 ° C for 48 hours, lettuce is 5 ° C for 72 hours, can promote germination and increase germination rate. You can also sprinkle some short straw or straw on the seedbed; or cover the seedbed with a shade net, or cover the shade, cover the old film.

three. Prevention of pest and disease hazards: Vegetable virus disease occurs severely under high temperature. Various measures should be taken: In addition to the above-mentioned nursery facilities, it is also possible to mix seedlings with Luheng No. 1 and use 1 to 1.5 grams per kilogram of seed; select antiviral varieties; use nylon mesh Yarn-proof; use silver-gray membrane to avoid cockroaches; timely control of mites and other pests and diseases.

four. Preventing the danger of heavy rain: The heavy rain in summer makes the soil compact, which is not conducive to seed germination. The following measures should be taken: selecting a high-dry land to build a seedbed; suitable for rainstorm areas should choose sand loam seedlings; the drainage around the seedbed should be smooth, and temporary cover should be used to reduce the rainstorm hazard; if the seed is not unearthed after the sowing, the seedling bed will be after the rain. Shallow cultivating to prevent soil knots.

Fives. Prevention of drought hazard: The following measures should be taken: sowing in the seedbed after pouring the bottom water, or fully filling the water and then sowing the soil; covering the plastic film (removing immediately after emergence); watering the seedbed in the morning or evening.

six. Preventing seedlings from growing up: It is easy to grow in high temperature seasons. It is necessary to take the following measures to prevent: watering with watering cans in the morning and evening, timely seedlings or seedlings; the nutrient area of ​​the seedlings should be larger; cucumbers and tomatoes can be sprayed with ethephon to control the seedlings. Tomatoes are sprayed once with 40% to 50% chlormequat 1000 times in the 5 and 7 leaf stages, which can make the seedlings thick, the leaves are dark green, the leaves thicken, and the flower buds are promoted.