Applications of Two Different Greenhouses in Intensive Seedling in Summer

In Hebei Zhuozhou area,two kinds of greenhouse(modern greenhouse and solar greenhouse)were compared,temperature,air humidity and cost of two different greenhouses in intensive seedling in summertime were studied.The results showed that daily maximum temperature was below 31℃ in solar greenhouse and below 30℃ in modern greenhouse from July 24 to August 31,2012.There was no difference in daily maximum temperature between two greenhouses during the first ten-day period of September.Since mid-September,daily maximum temperature decreased to a low level of 16.4～25.3℃ in solar greenhouse and 15.7~23.5℃ in modern greenhouse.The daily minimum temperature showed same declining curve in two greenhouses.But it was 1~2℃ higher in solar greenhouse than that in modern greenhouse since late September.To October 11,the daily minimum temperature decreased to 12.5℃ in solar greenhouse and 11℃ in modern greenhouse.The air humidity in solar greenhouse was higher before mid-September and lower since mid-September than that in modern greenhouse.Construction cost and electricity cost per seedling area in solar greenhouse was only 27.9% and 49.0% of that in modern greenhouse.But the land utilization efficiency of solar greenhouse was 49.6% of modern greenhouse. In Hebei Zhuozhou area,two kinds of greenhouse(modern greenhouse and solar greenhouse) were compared,temperature,air humidity and cost of two different greenhouses in intensive seedling in summertime were studied.The results showed that daily maximum temperature was below 31℃ in solar greenhouse and below 30℃ in modern greenhouse from July 24to August 31,2012.There was no difference in daily maximum temperature between two greenhouses during the first ten-day period of September.Since mid-September,daily maximum temperature decreased to a low level of 16.4～25.3℃ in solar greenhouse and 15.7～23.5℃ in modern greenhouse.The daily minimum temperature showed same declining curve in two greenhouses.But it was 1～2℃ higher in solar greenhouse than that in modern greenhouse since late September.To October 11,the daily minimum temperature decreased to 12.5℃in solar greenhouse and 11℃in modern greenhouse.The air humidity in solar greenhouse was higher before mid-September and lower since mid-September than that in modern greenhouse.Construction cost and electricity cost per seedling area in solar greenhouse was only 27.9%and 49.0%of that in modern greenhouse.But the land utilization efficiency of solar greenhouse was 49.6%of modern greenhouse.