This summer, the rain is obviously more than before. After entering the autumn, the rainfall will increase compared with last year. I hope that the farmers will pay attention to the safety of the shed, timely repair and drainage , to prevent the damage caused by the collapse of the shed due to heavy rain.
　　 First, do a good job before the rain to avoid rain and wet the shed
　　 In recent years, severe weather such as heavy rain and hail has increased, and the maintenance of greenhouses should be highly concerned by vegetable farmers. Rain protection in greenhouses is mainly divided into wall rain protection, rear roof rain prevention and drainage anti-backflow.
　　 1 . Do a good job of wall maintenance. In recent days, there has been more rain, and a small area collapsed on the back wall of some vegetable farms in Qingxu, and the wall gradually became thinner, which affected the insulation of winter greenhouses. The investigation found that rainwater soaking is the main cause of wall collapse. The film on the wall is broken and holes are formed. When it rains, the water flows to the wall with the hole, causing the wall soil to loosen and eventually collapse. The vegetable growers should maintain the shed body and cover the film or non-woven fabric to avoid this happening again. It should be noted that the shed film is exposed to wind and rain, and the aging speed is fast, and it is easy to be scratched. If the time is long, it will be damaged, which will cause the wall to be wet after the rain. Therefore, it is necessary to check the damage of the shed film in time before heavy rain comes, and pay attention to repair.
　　 2 , do a good roof maintenance. Many roller blinds are placed at a low position on the rear roof. Rainwater collects at this location to cause water ingress. Pay attention to raising the position of the opening. From the inside of the shed, the mulch film, foam, etc. can be plugged up along the inner corner of the triangle iron, and the film covered with the outer surface can be swelled up.
　　 The arch shed should focus on the maintenance of both sides of the shed, clean the shed corridor, dig the drainage ditch, and set the rainproof membrane. The lower end of the film of 0.6-0.7 m can be buried in the soil, and the upper end is fixed by the steel wire, which can effectively prevent strong Rainwater enters the shed during rainfall.
　　 Second, pay attention to timely drainage when raining, to avoid rainwater infusion
　　 Most of the vegetable greenhouses currently built are excavated, and some sheds even dig more than 1 meter. Once a short rainstorm occurs, the drainage is not timely, and it is easy to cause rainwater to infuse, which will not only wet the shed, causing the shed to collapse, affecting the service life of the greenhouse, and affecting the cultivation of the squat vegetables, causing heavy losses.
　　 1 . Dig the ditch in front of the shed. The underground shed has a low terrain, and even if the trench is dug, sometimes the water is difficult to discharge. It is recommended that the vegetable farmers increase the depth of the drainage ditch and build a deep ditch with a certain water collecting effect. 1.5 meters away from the front of the shed , the trenches are about 1 meter wide and 0.5-1 meters deep , so that the water flowing down the greenhouse can be temporarily concentrated to prevent excessive water from flowing into the shed. 2 . In case of heavy rainfall caused by typhoon, it is necessary to set up pump drainage in time. When constructing a shed area, it is necessary to plan flood control ditch or other ditch to facilitate drainage. In particular, when encountering a torrential rain that exceeds 100 mm in a short period of time, it is also necessary to pay attention to the timely installation of the pump to drain the drain and drain, so as to avoid immersion in the shed after the catchment tank is full.
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