塑料大棚内黄瓜叶片露时的计算方法

1.采用单叶的能量平衡方法,建立大棚黄瓜叶片的露时模式。模式运行结果:结露期间的叶片温度计算值与测量值差异极不显著(|t|0.50,S=0.291,n=25);结露时间、露干时间和露时的计算值与观测值差异不显著(|t|0.40,平均差异分别为21、-6和-25分钟。2.根据叶湿频率与相对湿度的关系,得出大棚黄瓜叶片结露的临界相对湿度为93％。用此临界相对湿度估算露时,误差一般不超出1小时。

A Method of Calculating Dew Duration on Cucumber Leaves in Film Plastic Greenhouse

A mathematical model of dew duration on cucumber leaves in film plastic greenhouse was developed useing the theory of energe balanceon single leaf. The difference between the calculated value and measured of The leaf temperature, dew duration and the time of beginning and drying to dew was not obvious. The average values were 21, -6 and -26 minutes separately. It was obtained, depend on the relation between the frequency of leaf wet and ralative humidity, that the critical value of relative humidity of beginning to dew on cucumber lesves in film plastic greenhouse was 93% The calculating error was less than one houre.