As the temperature rises, the night temperature in the shed is also greatly improved. At this time, if the shed vegetable management is improperly operated, it is prone to the phenomenon of lengthening, high temperature obstacles and hormone poisoning, causing problems such as falling flowers, falling fruits, yellowing of leaves, premature aging, etc. The current vegetable management should do a good job of three defenses.
One must guard against the abbot. As the temperature rises gradually, the temperature difference between day and night becomes smaller, and vegetable plants are prone to grow up, especially the solanaceous vegetables and melons. Once the plant is long, it is easy to cause falling flowers and fruit. Even if you sit on the fruit, it is easy to have deformed fruit such as hollow fruit. In order to prevent the chief, first of all, pay attention to the temperature difference between day and night; the amount of nitrogen fertilizer applied should not be too large, and try to increase the application rate of phosphorus and potassium fertilizer to promote plant fruit set. If necessary, you can spray more than 3000 times of the tomato or sweet pepper, or control the 750 times of the liquid, and control the growth of the 750 times solution of the melon vegetable or the 1500 times solution of the chlormequat.
Second, we must prevent high temperature obstacles. Under high temperature and strong light conditions, vegetables are prone to high temperature obstacles such as sunburn. It is recommended that in the management of vegetables, the removal of leaves should not be excessive. In addition to high temperature protection, it is necessary to spray boron and calcium fertilizer on the foliage in time to promote the occurrence of physiological diseases such as flowering and fruit rot and anti-umbilical rot.
Third, we must prevent hormone poisoning. After the temperature rises, when the flowers are scented or scented, the concentration of the anthers should be reduced, and the principle of using the low concentration of hormones at high temperatures should be used. Excessive use of hormone concentration will affect the flower bud differentiation of the plant, causing the leaves to shrink and deform, the growth is blocked, and the deformed fruit appears. At present, the peach-shaped fruit and the cucumber head-head of tomato are mostly caused by the decrease of the concentration of anthocyanins or anthers. After the discovery of vegetable hormone poisoning, it can be sprayed with alizarin lactone (Yunda 120) or loved to receive 6000 times liquid or nucleotide (green wind 95) 400 times solution.