蔬菜大棚不利的环境因素及对策一、蔬菜大棚不利的环境因素１．透光率降低。大棚内的光照不如露地充足，其透光量为露地自然光量的６０％～７０％，如果塑料薄膜老化或粘附了尘土、水珠，则射入的光照会更少。２．棚内昼夜温度变化快，温差大。在晴天的午后棚内气温可高达... Greenhouses unfavorable environmental factors and countermeasures First, adverse environmental factors greenhouse vegetables 1. Transmittance decreases. The light in the greenhouse is better than the light in the open field. The transmitted light is 60% ~ 70% of the natural light in the open field. If the plastic film is aged or adheres to the dust or water drops, the illumination will be less. 2. Shed temperature changes rapidly, the temperature difference. In the sunny afternoon shed temperature can be as high as ...