Buffer film under the vent Setting a buffer film under the air vent can not only prevent weeds and dust on the grass curtain outside the shed from entering the shed and falling on the leaves of the plants, affecting the photosynthesis of vegetables, and more importantly, avoiding cold air during air release Blow directly on the vegetables under the air vent, causing a drastic change in the temperature and dry humidity of the surface of the vegetables and fruits, causing the "dry edges" of the vegetable leaves and the "prickly skin" of the fruits. To good protection. Buffer door at shed door In order to protect the vegetables at the entrance of the greenhouse and prevent cold wind from blowing into the greenhouse, vegetable farmers can set up a buffer room at the entrance of the greenhouse. Vegetable farmers who have doors on the back wall or on the east and west gables can set up a buffer room in the shed. A film with a width of about 4 meters and a length of 6-10 meters is required. One side of the film is fixed on the post on the back wall of the greenhouse. , And then use steel wire or nylon rope to suspend and fix the film from the width of the shed and the shed, so that the shed film on both sides is closed to form a closed space. When the vegetable farmers enter the shed, they only need to lift up the film at the end of the buffer room to enter. This buffer room can also be used to store the farmers' clothes to prevent the humid air in the shed from getting wet. For the entrance outside the shed, vegetable farmers can use grass curtains to wind, but be sure to wrap the grass curtains with a film to reduce the air permeability of the grass curtains. Open the air vent at the upper part of the shed in time The first time: After opening the straw curtain for 1 hour, open the upper air vent about 3 cm to release small wind, supplement the carbon dioxide in the shed, add raw materials for the smooth photosynthesis, and at the same time, can discharge the sulfur dioxide and carbon monoxide in the shed as early as possible And so on. Photosynthesis takes about one hour, and the carbon dioxide concentration decreases to about 0.01%, and the photosynthetic rate will gradually weaken even under strong light and high temperature. Therefore, at this time, it is necessary to release the wind earlier to allow carbon dioxide to enter the shed as early as possible to create conditions for photosynthesis. Second time: when the temperature of the shed rises above 28 ° C, as the temperature in the shed grows, it is advisable to gradually open the air outlet 8-10 cm, and for the need to grow higher temperature For greenhouses of vegetables such as cucumbers and loofahs, just open the air vent 6-8 cm. Pay attention to letting off air even on cloudy days In shed management, the influence of overcast weather is also the most troublesome thing for vegetable farmers, because once the management is not proper, the loss is very huge, especially for some melons and legumes. In order to ensure the temperature in the shed, many vegetable farmers do not release air for several days on a cloudy day, which is extremely detrimental to the growth of vegetables. In winter, when there is a cloudy day, if the temperature in the shed allows, the air vent must be open for ventilation. When releasing the wind, do not let it go out too early to prevent the temperature in the shed from decreasing and affecting the growth of vegetables. During the air release, you can choose between 12 noon and 2 pm, and it is advisable to open the air outlet 6 to 8 cm, the air release time is 10 to 15 minutes, and then close the air outlet in time to prevent the temperature in the shed Reduced too much. When the interval is 30 minutes, the air is released again for 10 to 15 minutes. After 2 to 3 consecutive air releases, a large amount of harmful gas in the shed can be discharged to the outside of the shed, and it is also conducive to reducing the humidity in the shed and suppressing it. The occurrence of disease. When the greenhouse is ventilated, it must be carried out when the temperature in the greenhouse is higher than the temperature suitable for the growth of specific vegetables, so as to avoid cold or frost damage to the vegetables due to the indoor temperature being too low after the wind is released. Therefore, we must understand and master the temperature requirements of various stages of vegetable growth and development. When ventilating the greenhouse, you should adhere to the principle of going from small to large, from small to large, and letting the wind go. At the same time, we should also pay attention to adjusting the local temperature difference in the shed. In the high temperature place, ventilate relatively early and the air outlet is relatively large; in the low temperature place, it is relatively late and the air outlet is small. When closing the air vent, it should be done gradually from large to small and more to less. In addition, when ventilating, you should prevent the cold wind from blowing directly on the vegetable plants in the shed, which will cause the temperature to rise and fall, resulting in freezing damage to the vegetable leaves and young fruits. The time of time ventilation should generally be carried out when the temperature in the shed is too high, the relative humidity is high, and photosynthesis is accelerated. In addition, after watering and fertilizing or spraying pesticides, the humidity should be increased for a short time. If it encounters a long cloudy weather, the cover of the shed should be uncovered at intervals, and the amount of air released should be small to prevent excessive sunlight and transpiration, which will cause the vegetables to lose water and wilted. Disclaimer: Some articles on this website are transferred from the Internet. If you have third party legal rights, please inform this website to deal with them. phone
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The method of setting the buffer film is also very simple. A long steel pipe is installed on the steel frame of the greenhouse 30 to 40 cm south of the vent on the roof of the shed, and a 1.5-meter-long steel pipe is welded on this steel pipe every 10 meters or so. Short steel pipe, and the angle between the short steel pipe and the roof is 45 degrees. The other end of the steel pipe is pulled by a rope or thin iron wire and tied to the steel frame of the roof. Then, the short steel pipe is 20 to 30 away from the air outlet. At a centimeter, pull a plastic film about 1.2 meters wide in the east-west direction.
Precautions 
Winter Shed Qiao Ventilation Disease Goes No Trace
In recent days, many growers have reported that due to improper ventilation, the vegetables in the greenhouse have appeared fruit peels, dry edges and wounded roots. Even farmers who have been engaged in greenhouse production for many years often make mistakes in greenhouse ventilation techniques. Bring unnecessary losses.