As the temperature continues to rise, greenhouse vegetable cultivation will also face many problems. If it is not properly managed, it will lead to leggy, high temperature and hormonal poisoning, resulting in vegetables falling, falling fruit, leaf yellowing, premature aging and other issues, it is recommended that the current vegetable management We must do a good job of "five defenses."
1. Prevention of leggy. As the temperature rises, the temperature difference between day and night becomes smaller, and the vegetables are prone to leggy. Once leggy, it is easy to cause falling flowers and fruit, and even if they are sitting, they are prone to empty fruit and malformed fruit. In order to prevent leggy, we must first pay attention to the temperature difference between day and night; next, the amount of nitrogen fertilizer application should not be too large, try to increase the amount of phosphorus and potassium, and promote plant set fruit.
2. Prevent excessive over-application of fertilizer. After entering the middle growth stage, the amount of fertilizer needed by the plants increased. When the number of watering and the amount of watering were appropriately increased, a multi-element fertilizer was applied once every 7 days in combination with watering. Also, top-dressing should grasp the principle of “a small number of times†to avoid waste caused by excessive one-time application of chemical fertilizers, or excessive burning of roots.
3. Anti-hormone poisoning. When the temperature rises, when the vegetables are used for flowering or picking melon, the concentration of the anthers should be reduced. The use of too high concentrations of hormones will affect the flower bud differentiation, resulting in leaf shrinkage, deformity, growth obstruction, malformation, such as the current tomato peach fruit and cucumber big head melon, most of the farmers did not reduce the concentration of anthers. Once the symptoms of hormonal poisoning are found, they can be sprayed with Bijing, alkaloids, etc.
4. Prevent pests and diseases. As temperatures increase, pests and diseases increase. In this regard, vegetable farmers should focus on prevention and comprehensive prevention and control to control the spread of pests and diseases. Common diseases such as cucumber, zucchini, tomato gray mold, tomato late blight, eggplant vegetables Verticillium wilt, bacterial wilt, blight, ulcer disease; pest control must also keep up, common such as greenhouse whitefly , Aphids, Liriomyzae, etc., vegetable farmers should promptly spray control. It is also necessary to spray boron and calcium fertilizer on the leaves in time to promote the occurrence of physiological diseases such as flowering and fruit setting, and preventing umbilical rot.
5. Anti-high temperature barriers. After entering the end of April, the temperature is higher and the light is strong, and vegetables are prone to high-temperature disorders such as sunburn. It is suggested that in the management of vegetables, picking up leafhoppers should not be too much at one time. At the same time, the shade nets can be cooled in time according to weather conditions.
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