Snowy weather greenhouse vegetables how to control
October 31 20:59:41, 2024
In recent days, the outside temperature has dropped sharply, and heavy snow falls in Weihai and other places, which has caused certain obstacles to greenhouse vegetable production. With the advent of deep winter, cloudy snow weather is inevitable, and vegetable farmers should promptly take preventive measures to mitigate the damage. Here, some of the precautions are summarized as follows: First, protect grasshoppers and warm them properly. Once the grasshopper is wet with snow or dew, it becomes a heat absorber, which will greatly reduce its cold insulation. Covering the grasshopper with a layer of film can reduce the heat loss in the shed and prevent the rain and snow from soaking the grass and reduce the heat preservation. In addition, cloudy snow days, due to the thick clouds in the sky, the temperature is generally not very low. In order to protect the grasshoppers, it is not necessary to cover the grass in the snowy days. After the snow stops, the snow on the shed is cleaned and the grass cover is added at night. There is no direct light in cloudy snow, and the temperature inside the shed will decrease as the outside temperature drops. In the event of such weather, temporary warming should be provided to the shed, and the temperature inside the shed should be raised to about 15°C to prevent the danger of low temperature. Second, cloudy snow weather exposes the glory, long yin clear and sunny attention to look back. As the saying goes, everything grows on the sun. Some large shed households are not exposed on cloudy snow days, and they are not even exposed for several days. The reason is that they are afraid of freezing seedlings. Although there is no direct light on cloudy days, the scattered light through the clouds can also increase the temperature in the room. It was determined that the temperature in the shed was raised by 2°C to 3°C higher than that of the uncovered ones after the thick cloudy snow days. What's more, if the plants do not see light for a few days, they can easily become infected with "yellowish yellow," which can lead to death. In snowy days, the temperature in the shed is very low. Once it is sunny, the sun shines on the film, the temperature in the greenhouse will increase rapidly, and the temperature of the soil will increase relatively slowly. After the temperature rises, the transpiration of the leaf water also accelerates, because at this time the soil temperature is low and the water absorption capacity of the roots is weak, so the plants are prone to wilting and death. Therefore, we should pay attention to the weather when we encounter a long and sunny weather. The first few to expose a few, make the indoor temperature rise slowly, and observe the performance of the blade. If the leaves are normal, then gradually increase the number of exposing them until they are all uncovered; if any wilting phenomenon is found, promptly cover a few grasshoppers. Sometimes it takes 1-3 times to expose and recall. Third, strengthen the cultivator, moderate ventilation. Winter vegetable production, the amount of base fertilizer is generally more adequate. Due to the low temperature in winter, the amount of plant growth is less, so the amount of fertilizer needed and the amount of water required are also moderate, and the amount of fertilizer and watering can be appropriately managed. However, cultivating ridges often requires cultivating soil to increase the soil temperature and discharge carbon dioxide and some harmful gases released from the decomposition of fertilizers in the soil, allowing fresh air to enter the soil layer and promote root growth. If the whole shed is covered with plastic film, cultivator may have difficulties. Prompt ventilation and reduction of the humidity in the shed are important means for preventing the occurrence of diseases. High air humidity is one of the important factors for the incidence of vegetables in the greenhouse. As long as the temperature in the greenhouse is allowed, it must be ventilated as far as possible to prevent the occurrence of diseases. After the exposing in the morning, due to the low outdoor air temperature, a large amount of floating fog will form in the room. At this time, if the diaphragm is ventilated, the temperature inside the shed will drastically drop, which will adversely affect the growth of the vegetables. Generally, the time for decidua ventilation and dehumidification should be increased after the outside temperature and indoor temperature rise, and a small joint of 15 to 20 centimeters should be opened from the top of the ridge and closed after half an hour to facilitate warming and heat storage. In the same way before and after noon ventilation again 1 or 2 times. Do not avoid ventilating the entire day in order to prevent the disease. This kind of "defective food" management method is not desirable.
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