Snow shed vegetable management catches five points
In the winter, when it encounters rain and snow, the temperature suddenly drops, which will adversely affect the growth of greenhouse vegetables. The following five points should be grasped in the management of wintering greenhouse vegetables:
Strengthening management The temperature in the shed in the snowy weather is relatively low, and the plants are in a dormant state. Once the weather is clear, the temperature in the shed will rise rapidly, which will easily cause the leaves to lose water and wilting. In order to prevent the plants from wilting, the grass hoe should be repeatedly covered. If necessary, the leaves can be sprayed with water to make the temperature rise slowly, so that the vegetable plants can adapt to the surrounding environment. It usually takes 2 to 3 days to return to normal. Growing.
Covering grasshoppers In the evening of cloudy and snowy weather, the grasshopper (grass curtain) should be covered with a layer of cold-proof plastic film, which can increase the temperature in the greenhouse from 2 °C to 3 °C. If the seedlings are raised in the shed, a small arch shed should be built on the nursery, which is beneficial to the heat preservation of the seedbed and ensure the safe growth of the seedlings.
Supplemental lighting The greenhouse vegetables are afraid of even cloudy weather and insufficient light. Therefore, enhancing and supplementing the lighting in the shed is very important to ensure the normal growth of vegetable plants. A reflective film can be hung on the back wall of the shed to increase the light intensity in the cultivation bed. Fluorescent lamps can also be installed in the shed to manually replenish the light. In the case of weak snow and light, the light will be turned on for about 3 hours in the morning and evening, which not only can supplement the light, but also increase the temperature in the greenhouse and promote photosynthesis.
Adjusting the environment After rain and snow, the shed is almost in a closed state due to low temperature, low ventilation and ventilation. It is easy to cause excess oxygen in the air and insufficient carbon dioxide, which has a great impact on the respiration of vegetable plants. Carbon dioxide fertilization technology can be used to adjust the air content in the shed, supplement the carbon dioxide content, and also enhance the cold resistance of vegetable plants.
Foliar spray fertilizer In the case of low temperature and weak light, the ability of the roots of greenhouse vegetables to absorb nutrients is greatly weakened, and the ability of photosynthesis to produce nutrients is even worse. At this time, the hormone should be used as little as possible or not, and the method of spraying potassium dihydrogen phosphate or urea solution and micro-fertilizer on the foliar surface should be effective.
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