棚栽黄瓜生产是在高湿条件下进行的,棚内达65%～85%的相对湿度是黄瓜生长的适宜湿度。用明水沟灌的夜间棚内湿度往往都在90%～100%,到早晨揭苫子后,棚内就有大量雾气产生,这时有人就想打开通风口进行放风排湿,其实这并不科学,因为早晨室内外温差小,放风根本排不出湿气。上午正是黄瓜利用室内的高二氧化碳 Shed cucumber production is carried out under high humidity conditions, the shed reached 65% to 85% of the relative humidity is the appropriate growth of cucumber humidity. Night water with irrigation ditch irrigation humidity are often 90% to 100%, after the morning to expose the raccoon, the shed there is a lot of mist, then someone would like to open the vent for ventilation, in fact, this is not Science, because the temperature difference between morning and evening is small, the wind does not discharge moisture. In the morning, cucumbers use indoor high carbon dioxide