As the temperature rises, the night temperature in the shed is also greatly increased. At this time, improper management of shed vegetables can lead to leggy, high temperature and hormonal intoxication, resulting in vegetables falling, fruit falling, leaf yellowing, and premature senescence. The current vegetable management must do a good job in the three defenses.
One must prevent leggy. As the temperature gradually rises and the temperature difference between day and night becomes smaller, vegetable plants are prone to leggy, especially for eggplant vegetables and melon vegetables. Once the plants are long, they are liable to cause falling flowers and fruit. Even if they are sitting and holding fruit, they are prone to malformations such as empty fruits. 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 fertilizers, and promote plant set fruit. If necessary, the tomato and bell pepper can be sprayed with 3,000 times more liquid or 750 times the strength of the auxiliaries. The spraying of the melons and vegetables with 750 times liquid or chlormequat 1500 times inhibits the growth of the melons.
The second is to prevent heat barriers. Under high temperature and strong light conditions, vegetables are prone to high-temperature disorders such as sunburn. In vegetable management, it is recommended not to use too much disposable leaf. In addition to anti-high temperature, but also in time to spray on the leaves of boron and calcium fertilizers, in order to promote flowering fruit set, anti-umbilical rot and other physiological diseases.
The third is to prevent hormone poisoning. When the temperature rises, when the vegetables are used for flowering or flowering, the concentration of the anthers should be reduced accordingly, and the principle of using the lower limit of hormone concentration at high temperatures should be used. The use of too high concentrations of hormones will often affect the flower bud differentiation, resulting in leaf shrinkage, deformity, growth obstruction, malformation. At present, the peach-shaped tomato and the cucumber-custard are mostly caused by vegetable farmers failing to reduce the concentration of thistle flower or anther. After the discovery of vegetable hormone poisoning, it can be sprayed with alizarin lactone (Yunda 120) or love more than 6000 times solution or nucleotide (green wind 95) 400 times solution.
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