1. Causes vegetables to be wet. Excessive rainwater, elevated groundwater levels, or poor drainage after flooding, or continuous overcast rain will cause the soil moisture to remain saturated. Hypoxia in soil causes the physiological activities of vegetables to be inhibited, affecting the absorption of water and fertilizers, and leading to the death of root systems. At the same time, harmful substances such as hydrogen sulfide and methane are produced to cause damage to vegetables. The continuous rain with the wet damage caused the lack of illumination of the vegetables, the heavy respiratory depletion, the declining growth, the falling of flowers, and the induction of many diseases. Wet damage to vegetables occurs mainly in the spring and summer, when it rains continuously, or when it continuously drops from heavy rain to heavy rain. Under the influence of cloudy rain and wet weather, the field is easily wetted with water, causing the seedlings to grow very slowly, even yellowing, mildew, and induce a variety of diseases, so that early sowing of vegetables in spring sowing, shorten the supply time, but also affect the summer vegetables Growth and development.
2. Cause damage to vegetables. Precipitation time is too long, too concentrated is the main reason for the formation of vegetable damage. In addition to mechanical damage caused by water damage to vegetables, the main hazard to vegetables is suffocation and hypoxia. Although aquatic vegetables are resistant to waterlogging, water can't survive without submergence. Most vegetables are very resistant, especially most melons. Beans and solanaceous vegetables. Most of the vegetables are flooded for several days or even one day. Severe damage may be caused. Although cucumbers in melons are more humid and moist, the cucumber roots have high respiratory intensity, need more oxygen, and are prone to hypoxia under the condition of water. And rotten root. In addition to the melons, the melons were more tolerant to moisture than other melons, especially watermelons and melons, but the water was dead. The root vegetables, legumes, and leafy vegetables were also required to have water. It is easy to die and infects many diseases.
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