After the heavy snowfall in winter or after continuous low temperature and low sunshine, if the temperature rises rapidly, the vegetables in the greenhouse will often appear wilting, and the lighter will delay the growth and development, and even the dead. The wilting is a phenomenon in which the moisture of the leaves is rapidly transpiration, and the supply is in short supply, which can be summarized into the following three cases:
In the first case, due to the low temperature in the early stage, some of the blades or the tips of the blades were damaged by freezing and lost the water retention function. At the beginning of the damage, the leaves or young shoots are water-soaked and will soon dry out and the color is green. It is often prone to breakage in the tuyere or cover film.
In the second case, the root or stem base is damaged by root rot, blight, bacterial wilt or underground pests. Check the roots and stems for signs of lesions or insect bites.
The third is physiological and temporary wilting. This is a relatively common phenomenon of wilting. On the one hand, due to long-term low temperature and low temperature, the soil and air humidity in the shed are large, which makes the root system undeveloped. On the other hand, the temperature rise in the shed increases the leaf surface transpiration, while the soil temperature rises slowly and the root activity is low.
Remind everyone that the first two types of wilting are pre-victims but the symptoms are not obvious, although the performance is obvious after the weather, but the roots are mainly in the early stage. Part of the reason for the third case is also in the early stage, but mainly the current response should be reasonable. As long as scientific management, generally can resume normal growth.
In short, in addition to the targeted measures such as temperature increase and heat preservation and spraying of chemicals to control pests and diseases during the cold current, the implementation of reasonable cultivation management and cultivation of strong seedlings is the basis for coping with strong climate changes. Pay attention to heat preservation during low temperature, but not blindly close the greenhouse. In management, water control, root promotion, humidity reduction and disease prevention are needed. When the outside world heats up quickly, it is necessary to adjust the time of the curtain to cover and cover, and to change the temperature of the shed and gradually refine the seedlings. Vegetables should observe the changes found wilting vegetables, should be immediately put thatch or partial shading, reducing transpiration, recovery after exposing thatch, two to three days after exercise, you can turn the normal management.
In addition, do not fill the water when there is wilting, you can spray the foliar fertilizer to promote growth.
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