Some vegetables are not only prone to malnutrition during the summer hot season, but they are also susceptible to various diseases and pests. Therefore, nursery cultivation is required. In summer, the main vegetables that need to be transplanted are cauliflower, cabbage, celery, Chinese cabbage, and cabbage lettuce. In addition, tomatoes grown in the greenhouse in the autumn also need to be nursed in the summer. The highlights of the vegetable harvesting techniques in the hot season are briefly described as follows:
1. The plots that have been selected for plot cultivation should be high-dry and smooth, have good soil permeability and water retention, and be capable of irrigation and drainage, and should not be used to grow seedlings of the same kind of vegetables in Shangyu so as to avoid soil-borne diseases. In addition, it is important to remember not to raise seedlings on the land with severe pests in the ground. After selecting the plots, the farmyard manure, which is fully decomposed, will be used as the base fertilizer, and the crop will be ploughed after fertilization.
2. Pregerminate the germination of the lettuce and celery seeds before germination is difficult. Before sowing, germination should be performed 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 2~5°C for 48 hours; for the treatment of lettuce seeds, they can be kept at a low temperature of 5°C. 72 hour. To prevent high temperature hazards, sprinkle some wheat straw on the seedbed during nursery or cover the seedbed with a shade net.
3, prevention and treatment of viral diseases under high temperature vegetables often occur more severe, should take various measures to prevent. Aphids are the major mediators of viral diseases, and special attention should be paid to the control of aphids in the nursery process. In the cultivation, we should try our best to choose the varieties of antiviral disease. The seeds should be soaked with 10% trisodium phosphate solution before sowing.
4, to prevent heavy rain in summer high temperatures and more rainfall, in the nursery should choose Gaosao to build seedbeds, rainstorm more areas should choose to cultivate seedlings in sandy soil, seedlings around to be unobstructed. 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.
5, to prevent soil drought After the seedbed is built, it should be poured foot water, and then sowing, can also be fully watered before the site preparation of the bed, and then sowing, sowing after the cover and repression, covering the film, pay attention to after emergence Membrane should be removed immediately. In addition, the seedbed should be sprayed every morning or evening.
6, to prevent seedlings leggy cultivate vegetable seedlings in the summer, due to higher temperatures, seedlings are extremely prone to long, so take preventive measures. Can be used every morning and evening with a watering can watering, seedlings grow up in time after the seedlings or seedlings to expand its nutritional area. 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 in the 5th leaf and 7th leaf stage to promote seedling stem sturdiness and promote flower bud differentiation.
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