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日光温室经济效益低是令生产者十分头疼的事情,如有些温室每300平方米收入仅2500元左右。据我们调查分析,造成效益低的原因有以下几方面。 一、温度偏低 温室墙壁厚度不够,后墙外未加防寒土,夜间覆盖草帘太薄,保温性能差,致使温室内夜间温度下降太快。如下午盖棚时室内温度为18～20℃,次日清晨降为0～5℃,蔬菜生理机能出
Low economic efficiency of solar greenhouse is a very headache for producers of things, such as some greenhouse income of only 2,500 yuan per 300 square meters. According to our survey and analysis, the reasons for the low benefit include the following aspects. First, the temperature is too low The thickness of the greenhouse wall is not enough, the back wall without anti-cold soil, grass curtain covering too thin at night, poor insulation properties, resulting in the greenhouse temperature dropped too fast at night. As the afternoon cover the shed when the indoor temperature is 18 ~ 20 ℃, the next morning dropped to 0 ~ 5 ℃, vegetable physiological function out