In winter greenhouse vegetables, after a few days of low temperature, if the weather suddenly shines, many vegetables will appear different degrees of wilting. Some of the leaves lost water seriously, as if they were evaporated. Some plants showed wilting, and even severe dead trees occurred. After pulling out the roots, it was found that most of the plants had poor root growth, bad root tips, and some root rot. However, some plants showed no obvious symptoms but only a 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 use of chemical fertilizers can cause the ground temperature to decrease, resulting in poor root growth or rot. In a continuous cloudy day, the vegetables adapt to the low-light environment. When the sun suddenly receives bright light after a sunny day, excessive moisture evaporates too quickly and causes 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 days suddenly can not immediately open all the grass seedlings, or plants will suddenly lose light due to strong light and wilting, it is recommended that farmers should first pull a few rows of friends Open grass rakes or pull half of the grass rake first to avoid sudden light exposure.
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 have been wilting plants. Spray water on the plants in a timely manner to supplement the water. At the same time, irrigate roots, promote rooting, increase the absorption capacity of vegetable roots, reduce the symptoms of vegetable wilting, and some vegetables can be irrigated after cultivating the soil.
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