In recent days, in the continuous rainy weather in northern China, the humidity in the greenhouse is large, resulting in plant growth, poor roots, and weak growth. After a cloudy day, the temperature in the greenhouse increases, causing a sudden increase in evaporation of the leaves of the vegetables. The ability of the root system to absorb water is less than the need for evaporation. The vegetables will experience acute wilting and affect their growth. In fact, acute wilting is a kind of physiological disease. As long as it is properly managed, it can be alleviated even after cloudy days. First, after the weather turned fine, measures were taken to allow the shed to warm up slowly. At present, there are no haystacks on the sheds, and the issue of pulling grasshoppers is not involved. It should mainly be adjusted from the air release point. Even after sunny days, the temperature in the shed suddenly rises. If the bleed outlet is immediately pulled to the maximum, the temperature in the shed will drop sharply, and it will easily lead to flashing of vegetables. Therefore, after the weather becomes fine, it is necessary to gradually expand the air outlets in the sheds and give the vegetables an adaptation process. In this way, the chance of acute wilting of vegetables can be reduced. Second, when the weather turns fine, in order to prevent the vegetables from wilting, the leaves are sprayed with water or foliar fertilizer in time. In continuous rainy weather, the growth of vegetables becomes weaker, and after the weather turns fine, the evaporation of leaves becomes larger. If water is added to the vegetables or the foliar fertilizer is sprayed in time, not only can the vegetables be supplemented with water, but also the nutrients needed for the vegetables can be supplemented. Improve the nutritional level of vegetables and increase the resilience of plants. Spray water can be sprayed with warm water at 20°C. Foliar fertilizer can use potassium dihydrogen phosphate, chitin and so on. Again, the rooting agent is fed to promote root development. In continuous rainy weather, the roots of vegetables are weakened. If you want to promote the growth of vegetable roots, timely rooting and grouting root-fertilizers, such as roots, etc., should be promoted after the weather turns fine to promote root growth. In addition, it is not scientific to water immediately after the weather is fine. In continuous rainy weather, the temperature of the soil in the shed was reduced, the roots became weaker, and the water absorption and fertility decreased. After the weather turns fine, the soil's volumetric heat capacity is large, the soil temperature rises slowly, and the roots are still weak; while the volumetric heat capacity of the air is small, the temperature rises quickly after the sunny day, the transpiration of the vegetable leaves is strengthened, and the water demand is higher. Watering immediately can easily lead to suffocation of the roots, yellowing of the leaves of the vegetables, and serious defoliation of some leaves. Remind vegetable farmers that they should be watered after the plant grows back to normal. It is best to apply biofungus fertilizer when watering to promote root growth and enhance the plant's resistance to stress.
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