In hot summer, how to cool down the greenhouse agricultural film?

When the hot summer comes, how to cool down in the greenhouse agricultural film? There are measures that we should take. Here are several effective ways to cool down in summer greenhouse agricultural film:
1. For plant varieties with slightly poor heat tolerance, shade nets can be used to shade and cool down, or traditional methods can be used to cover a layer of mud on the top of the greenhouse agricultural film to reduce the direct sunlight on the top of the greenhouse film and reduce the temperature in the greenhouse film.
2. Increase the ventilation of the greenhouse, the bottom of the greenhouse air outlet and the roof vent are open, so that the wind flow out, to open the bottom of the shed when the wind, in the inside of the shed set a windward film height of 60-80cm, the bottom with soil to bury, the upper side and the greenhouse agricultural film leave a gap 10-15cm wide, uncover the front of the greenhouse agricultural film bottom ventilation, the wind from the upper side of the windward film, that is, there is a good cooling effect, and the crop is not affected by the wind.
3. Scientific watering, increase the air humidity in the shed through watering. It can be watered every 3-5 days, each time the watering should not be too large, small water frequent watering. Under the premise of meeting plant production, to reduce the temperature in the greenhouse agricultural film.
4. Reasonable fertilization, flushing fertilizer with water, and applying different fertilizers according to different crop growth potentials to ensure the growth needs of plants.