Experts from the Association of Optical Agriculture and Technology reminded that seedbed ventilation is mainly to adjust the seedbed environment. At the initial stage of ventilation, it is necessary to ventilate every seam to avoid too fast ventilation. When it reaches 25℃ in the morning, it is necessary to manually start ventilation. First, open the upper seam for ventilation to prevent cold air from blowing directly on the seedlings. The conditions for vegetable farmers to raise seedlings are generally poor and too fierce. When the temperature drops to 18℃ in the afternoon, ventilation is also a very particular technology. Plastic greenhouses generally have two or three seams, and the film is supported by wooden sticks. With the increase of temperature, the vent gradually increases, so that cucumber seedlings can obtain suitable temperature and humidity. To maintain the leeward wind, the seedlings should be replenished with carbon dioxide gas in time through ventilation when growing. There was a slight mistake in raising seedlings in a small plastic arch shed in the greenhouse. The air outlet should release air and humidity in turn every day, especially in controlling the temperature of the seedbed.
Vegetable farmers raise seedlings in their own plastic greenhouses, which is different from factory seedling raising. Finally, let out the air at the bottom and gradually open the middle seam for ventilation, so that all previous efforts will be abandoned and ventilation will be carried out step by step. When the wind is strong.