Studies On The Control Of Air Humidity And Its Effect On The Temperature In The Plactic Shed In The Southern Areas

This paper studied the effects of reduction of air humidity and increment of air temperature in plastic shed in the southern areas by laying lime, covering plastic film, smoking, smoking + laying lime, smoking + covering plastic film, covering plastic film + laying lime, and smoking +covering plastic film + laying lime under different conditions, i.e. ventilation in a sunny, cloudy and rainy day, and without ventilation in a cloudy and rainy day respectively. The results showed that: (1) the effect of each treatment was different except that the difference was little at 14:00 under without ventilation in the cloudy and rainy day. Laying lime had least effect on reduction of air humidity, the next was covering plastic film and covering plastic film + laying lime, then it was smoking and smoking + laying lime, and the best was smoking + covering plastic film and smoking + covering plastic film + laying lime; (2) under different climate condition the effect on reduction of air humidity was the best in a sunny day, next cloudy and then rainy day; and (3) the effects on reduction of air humidity was better with ventilation than without ventilation.As for the effect of each treatment on reduction of air temperature: (l)smoking, smoking + laying lime, smoking + covering plastic film, and smoking + covering plastic film + laying lime all played their roles; and (2) ventilation decreased air temperature in plastic shed and this effect was the biggest in a sunny day, next in a cloudy day and finally in a rainy day.