Key points of vegetable breeding techniques in high temperature season

          Some vegetables are not only prone to poor growth during live broadcast in the summer hot season, but also susceptible to various pests and diseases, so seedling cultivation is required. In the summer, vegetables that need to be transplanted and transplanted mainly include cauliflower, cabbage, celery, Chinese cabbage, and lettuce. In addition, greenhouse tomatoes grown in the fall also need to be nursed in summer. The technical points of vegetable seedling cultivation in high temperature season are briefly described as follows:
The plots for selecting the plots should be high-dry and smooth, with good soil permeability and water retention, and can be filled with pots. Avoid planting seedlings of the same kind of vegetables in the upper sorghum to avoid soil-borne diseases. In addition, remember not to raise seedlings in the ground for serious pests. After selecting the plot, add fully decomposed farmyard manure as the base fertilizer, and apply shallow fertilization after fertilization.
Germination of lettuce and celery seeds is difficult, and germination should be carried out before sowing to increase the germination rate. The celery seeds should be soaked in water for 8 hours, then wrapped in wet gauze and 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. 72 hours. In order to prevent high temperature hazard, some wheat straw is sprinkled on the seedling bed during seedling cultivation, or the seedbed is covered with a shade net.
The prevention and treatment of viral diseases in vegetables at high temperatures often occur severely, and various measures should be taken to prevent them. Aphids are the main vector of viral diseases, and special attention should be paid to the control of aphids in the process of breeding. In the cultivation, try to choose the varieties of antiviral diseases. The seeds should be soaked in 10% trisodium phosphate solution before sowing.
To prevent heavy rain from damaging summer temperatures and heavy rainfall, we should choose high-dry land to build seedbeds when raising seedlings. Areas with more heavy rains should choose seedlings in sandy soil blocks, and drainage should be smooth around the seedbed. In case of heavy rain after sowing, it is difficult to unearth the young shoots. After the rain, it should be ploughed on the seedbed in time to prevent the surface layer of the soil.
Preventing soil drought After the seedbed is built, the foot water should be poured and then planted. It can also be fully watered before the soil is built. Then the soil is planted. After sowing, the soil is covered and pressed to cover the mulch. Note that immediately after emergence. Remove the mulch film. In addition, water the seedbed every morning or evening.
Prevent the seedlings from growing in the summer to cultivate vegetable seedlings. Because of the high temperature, the seedlings are very easy to grow, so take precautionary measures. Sprinkle water with a watering can in the morning and evening, and when the seedlings grow up, divide the seedlings or seedlings in time to expand their nutrient area. For cucumbers and tomato seedlings, ethephon can be sprayed in time when it is found to be long. Tomato seedlings can be sprayed once with 1000% of the 40% chlormequat in the 5th and 7th leaf stages to promote the stalks of the seedlings and promote flower bud differentiation.

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