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 plots that are selected for land plots should be high-dry and smooth, have good soil permeability and water retention, be capable of irrigation and drainage, and should not be used to grow seedlings that have been planted with similar vegetables in Shangyu in order 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.
Germination of lettuce and celery seeds is difficult to germinate. Germination should be performed 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 treatment of lettuce seeds can be kept at a low temperature of 5°C. 72 hours. To prevent high temperatures, sprinkle some wheat straw on the seedbed during nursery or cover the seedbed with a shade net.
Prevention of viral diseases Vegetable virus diseases often occur at high temperatures and various measures should be taken to prevent them. 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.
To prevent heavy rain damage summer high temperatures and more rainfall, nursery should be selected when the high dry to build seedbeds, rainstorm more areas should choose to cultivate seedlings in sandy soil, seedbeds 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.
To prevent soil drought, after constructing the seedbed, it is necessary to inject enough water and then sow the plant. It can also be fully irrigated and then set up the bed before planting. After sowing, the soil is covered and repressed and covered with plastic film. Attention should be paid immediately after emergence. Remove the film. In addition, the seedbed should be sprayed every morning or evening.
To prevent seedlings from growing seedlings of young vegetables in the summer, because of the high temperature, the seedlings are extremely prone to prolonged growth, so preventive measures must be taken. 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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