At present, vegetable greenhouses have been replaced with new ones. Then, for greenhouses with sheds, what problems should be paid attention to when changing membranes? The experience is summarized below.
Change the film to choose good weather
There are greenhouses in the shed, change the film must be chosen to be carried out in fine weather, should not change the film in the rainy days, so as to avoid sporadic droplets of bacteria floating into the shed, to induce the disease. At the same time, we must also pay attention to observe the wind power of the day. If the wind is too strong, do not change the membrane to prevent the wind from scratching the film.
When changing the film, pay attention to the temperature inside the shed and the outside world not to be too different
When the weather is fine, the temperature inside the shed is often very different from that outside the shed, and changing the membrane at this time can easily cause vegetables to “flashâ€. Therefore, change the film is best to choose before 10 o'clock in the morning or after 2 pm, change the ventilation should be increased before the change, to minimize the temperature difference between inside and outside the shed.
Pay attention to reduce moisture in the shed
When the humidity in the shed is large, there will be many dewdrops on the fruits of the vegetables. At this time, changing the membrane, the cold air suddenly entering the shed can easily cause the fruit to peel. Therefore, it is best not to water in the two days before changing the membrane to prevent the moisture in the shed from being too large. At the same time, the moisture in the shed must be drained before changing the membrane.
In addition, when changing the membrane, one should find more people to help, shorten the time for changing the membrane as much as possible, and minimize the effect of changing the membrane on vegetables.
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