The wind is strong and windy in spring, which causes many greenhouses to be blown by the wind, or the floating film is blown away by the wind. So how can vegetable farmers reduce these situations?
First, the floating film is pressed according to the wind direction. A northerly wind at level 5 does not turn over the straw curtain, but a westerly wind at level 4 can blow through the straw curtain. If the straw curtain is not blown out after being placed in the shed, it is necessary to use a floating film to prevent wind and focus on preventing the east wind Westerly. When putting the shed at night, if the wind is westerly or westerly, for the floating film fixed on the back slope of the shed, the vegetable farmer only needs to press the west side of the floating film so that the wind will not blow into the bottom of the floating film, and The air in the air bag formed when the floating film is released can be pressed out so that the floating film is closely attached to the straw curtain to prevent the strong wind from blowing up the floating film and overturning the straw curtain; when the east wind or the east wind is blown, take the opposite For the lamination method, for the floating film that is not fixed, the north side must be pressed well.
Secondly, the shed straw curtains are pulled early and released late. During the day, the wind rises in the morning and gradually increases, but the wind will gradually decrease in the afternoon, so vegetable farmers can pull the shed in advance. The lowest outdoor temperature in the morning is generally not lower than 0 ℃, and the duration is very short. The temperature rises quickly after the sun comes out, and the temperature in the shed will not drop significantly after the shed, so the vegetable farmers can advance the shed time to 7 am (In the future, as the weather gets warmer, the sunshine time is extended, and the shed time should be gradually advanced.) At this time, the wind is generally small and the straw curtain will not be blown over. In the afternoon, the wind gradually decreases, and vegetable farmers can postpone the shed time until after 5:00. For old straw curtains that have been used for many years, in order to prevent the wind from blowing over the straw curtain, multiple vegetable farmers can be put together to shorten the time to shed and reduce the chance of the grass curtain being blown by the wind.
Finally, the floating film is properly placed after being rolled up. For a greenhouse with artificially drawn straw curtains, the straw curtain will hold the floating film in the greenhouse, so there is no need to worry about the floating film being blown away by the wind. For greenhouses using roller shutters, vegetable farmers usually roll the straw curtain to the north side of the air vent 0.5-1 meters and it will stop. The straw curtain cannot hold the floating film. If the vegetable farmers directly roll the floating film on the back slope, it is very It is easy to be blown by the south wind. When the farmer can roll up the floating film 1-1.5 meters away from the fixed part, roll the stacked floating film to the northmost side of the floating film, and then fold the unrolled 1-1.5 meters floating film. , Cover the upper part of the rolled up floating film, so that even if the brick pressure is not used, it can prevent the south wind from blowing up the floating film.
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