濕氣是指空氣的相對濕度，即1立li方fang米mi中zhong水shui氣qi量liang與yu同tong一yi溫wen度du下xia達da到dao飽bao和he時shi的de水shui氣qi量liang百bai分fen比bi。由you於yu水shui分fen含han量liang的de多duo少shao與yu這zhe部bu分fen水shui氣qi所suo有you構gou成cheng的de壓ya力li成cheng正zheng比bi，所suo以yi通tong常chang用yong水shui氣qi壓ya來lai表biao示shi。溫wen度du越yue高gao，空kong氣qi的de飽bao和he水shui氣qi壓ya越yue大da。雖sui然ran升sheng溫wen後hou地di麵mian和he植zhi株zhu蒸zheng騰teng水shui分fen量liang也ye會hui加jia大da
，但dan因yin為wei是shi間jian接jie的de水shui蒸zheng發fa和he有you局ju限xian性xing的de，遠yuan不bu及ji提ti溫wen加jia大da的de飽bao和he水shui氣qi壓ya大da
，二er者zhe比bi值zhi降jiang低di，空kong氣qi濕shi度du就jiu降jiang下xia來lai了le。所suo以yi，棚peng室shi蔬shu菜cai在zai冬dong季ji和he早zao春chun管guan理li中zhong，不bu要yao把ba降jiang低di相xiang對dui濕shi度du隻zhi依yi賴lai於yu放fang風feng排pai濕shi上shang，提ti高gao溫wen度du同tong樣yang是shi降jiang低di相xiang對dui濕shi度du的de主zhu要yao措cuo施shi。

shineiwendugao，shiqida
，shiwaiwendudi，tebieshizaoshangjieshanhou，shangbukongqiwendujijuxiajiangdaoludianshi
，kongqizhongdeshuiqibianxingchengxixiaowudi。youyuwudimobunengyuwudiqinhe，suoyiwudizhihaozaishineipiaoliu
，dangwaijiewendushengqilaihou
，shineiwuqibianhuiziranxiaoshi。suoyi

，zaishineiyouwuqishi，kecaiqushengwen、降溫或推遲或及早揭草苫的辦法，使室內外露點溫度相遇時間變小，就不會長時期霧氣彌漫了。最好的辦法是，在南沿內，用1幅高30厘米普通膜，下端埋入前沿土中，上端適當拉開，讓霧進入有滴膜空間，隨膜下流，減輕霧氣的發生。嚴寒過後
，撤去地膜裙。