In winter vegetable greenhouses, after consecutively low temperatures for several days, the weather suddenly turns fine. Many vegetables will appear wilting to varying degrees. Some leaves lose water severely, as if they have evaporated, and some vegetables have wilted plants. Even dead tree phenomenon may appear, and after pulling out the root system, most of the plants will have poor root growth, rotten roots, and some root rot, but some plants do not have obvious symptoms. Physiological wilting.
The above symptoms are caused by continuous cloudy days. The vegetables in the greenhouse grow under low light and cannot perform normal photosynthesis. In this case, the vegetables evaporate less water, grow slowly or even stop growing, if the temperature drops at this time Excessive or excessive application of chemical fertilizers will cause the ground temperature to decrease and cause poor root growth or rot. In the dark days when the vegetables adapted to the low-light environment, when the sun suddenly received light, the evaporation of water is too fast, excessive evaporation of water occurs physiological wilting. In the cultivation and management, we must pay attention to weather forecasts at all times and reduce the economic losses caused by this through reasonable management methods and remedial measures.
First, if it is a sunny day before even a cloudy day, it cannot be watered, or it will easily cause excessive humidity in the greenhouse, causing poor root growth or root rot.
Second, after the weather is getting cold, do not use excessive amounts of chemical fertilizers, especially nitrogen fertilizers such as diammonium phosphate, urea, and high-nitrogen compound fertilizers, because the application of these fertilizers will cause a decrease in the temperature inside the greenhouse and affect the normal growth of the vegetable roots.
The third is to cover the grass seedlings, if you touch the sunny day after the sunny days can not immediately pull all open grass seedlings, or plants will be susceptible to strong light and evaporate quickly appeared wilting, it is recommended that farmers should first pull a few rows of friends Open grass rakes or open half of the grass rake first to prevent the plants from easily receiving bright light.
Fourth, in the cloudy winter days, a flood light can be set in the greenhouse or a light curtain can be added to supplement the light and ensure the normal growth of vegetables.
Fifth, there has been a wilting plant. Spray water on the plant in a timely manner to supplement the water. At the same time, it can be used for root irrigation. Any one of thiophanate-methyl or hymexazol or acetylphosphonium manganese zinc or anti-virus quinone can be used. , Add Hai Li or Chia Fung or Apollo 963 or one of the other rooting agents, mix and irrigate, promote rooting, increase the absorption capacity of vegetable roots, reduce the symptoms of vegetable wilting, some vegetables can be irrigated .
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