Traditional Culture Encyclopedia - Weather inquiry - The weather turns cold, and Agricultural University is going to replace the greenhouse film. What problems should be paid attention to when replacing greenhouse film?
The weather turns cold, and Agricultural University is going to replace the greenhouse film. What problems should be paid attention to when replacing greenhouse film?
If the film is replaced directly without ventilation, it is easy to cause "flash shed" (2) film replacement time. The shorter the film changing time, the better. The shorter the film changing time and the longer the dragging time, the greater the influence of external environment on greenhouse vegetables, which is not conducive to the growth of vegetables. (3) Choose sunny days. When replacing the greenhouse film, choose sunny weather, because it has the least adverse effect on vegetables. When we choose the right weather, we must choose the time to change the film. It is most suitable to change the shed film when the outdoor temperature is high at noon. At the same time, pay attention to the wind direction before changing the film. If the wind is too strong, don't change the film first, so as not to blow it off when changing the film. (4) pest control.
After replacing the plastic film in the greenhouse, it should be sprayed and disinfected immediately. During the film changing process, various pests and pathogenic spores may enter the shed. Therefore, pesticides should be sprayed immediately after replacing the new membrane to prevent insects and sterilize. The bactericide can be selected from chlorothalonil, metoprolol and other bactericides. Insecticidal bacteria can use imidacloprid and chlorpheniramine, which can kill most pests. Replacement method of greenhouse film. Under normal circumstances, many farmers grow vegetables first, and then change the greenhouse film. However, in the process of replacing the greenhouse film, it is easy to have problems that affect the growth of vegetables. After mastering the above four points, you can change the shed film more safely.
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