In recent days, the continuous cloudy and rainy weather in northern China has caused large humidity in greenhouses, resulting in leggy plants, poor root systems, and weak growth. After a cloudy day, the temperature in the greenhouse has increased, causing a sudden increase in the evaporation of vegetables. The ability of roots to absorb water is less than the need for evaporation, and 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.
It is best not to uncover all the straw curtains to prevent the lean plants from seeing rain and see the light suddenly. The temperature in the shed will suddenly increase, causing the water evaporation of the plants to increase, causing temporary wilting of the plants. Some straw curtains should be put down to cool down, etc. After the plants resumed growth, they were all uncovered and after 2 or 3 repetitions, the normal growth of the plants was guaranteed.
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 root system of vegetables will become weaker. If you want to promote the growth of vegetable roots, the root mulching fertilizer should be timely irrigated 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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