bizheduoniancongshipengcaishengchanjishuzhidao
，faxianjishishiduoniancongshipengcaishengchandenongminpengyouyechangchangzaidapengtongfenghuanqijiqiaofangmianchuxianchacuo
，geishengchanzhedailaibubiyaodesunshi。yinci，yunongminpengyoutantaodapengshucaizaipeitongfenghuanqifangmiandexuewenhenyoubiyao。dongchunjijie，zhongzhishucaidedapengruhejinxingtongfenghuanqine

？

必須明確大棚通風換氣的目的是調節棚內的溫度
、濕(shi)度(du)和(he)二(er)氧(yang)化(hua)碳(tan)的(de)濃(nong)度(du)以(yi)及(ji)排(pai)出(chu)有(you)害(hai)氣(qi)體(ti)。正(zheng)確(que)適(shi)宜(yi)地(di)把(ba)握(wo)通(tong)風(feng)換(huan)氣(qi)技(ji)術(shu)尤(you)為(wei)重(zhong)要(yao)。農(nong)民(min)朋(peng)友(you)在(zai)實(shi)際(ji)生(sheng)產(chan)和(he)操(cao)作(zuo)過(guo)程(cheng)中(zhong)，應(ying)注(zhu)意(yi)以(yi)下(xia)原(yuan)則(ze)和(he)措(cuo)施(shi)。

1.溫度：dapengtongfengshibixuzaipengneidewendugaoyushiyiyujutishucaishengchangdewendushifangkejinxing，yimianyinfangfenghoushineiwenduguodiduigaizhongshucaizaochenglenghaihuodonghai。yincibixulejiehezhangwogezhongshucaideshengchangfayugegejieduanduiwendudeyaoqiu。

2.放風量：大棚通風時要堅持從小到大，由少到多，順風向放風的原則。同時
，也要注意調節棚內局部溫差，在高溫處要相對早通風，放較大風口；在(zai)低(di)溫(wen)處(chu)要(yao)相(xiang)對(dui)晚(wan)放(fang)風(feng)
，放(fang)小(xiao)風(feng)口(kou)。關(guan)閉(bi)放(fang)風(feng)口(kou)時(shi)則(ze)應(ying)該(gai)由(you)大(da)到(dao)小(xiao)，由(you)多(duo)到(dao)少(shao)逐(zhu)步(bu)進(jin)行(xing)。另(ling)外(wai)通(tong)風(feng)換(huan)氣(qi)時(shi)應(ying)防(fang)止(zhi)冷(leng)風(feng)直(zhi)接(jie)吹(chui)向(xiang)棚(peng)內(nei)蔬(shu)菜(cai)植(zhi)株(zhu)，導(dao)致(zhi)溫(wen)度(du)忽(hu)高(gao)忽(hu)低(di)
，造(zao)成(cheng)蔬(shu)菜(cai)葉(ye)片(pian)和(he)幼(you)果(guo)遭(zao)受(shou)冷(leng)凍(dong)傷(shang)害(hai)。

3.通風換氣的時間要求：放fang風feng換huan氣qi的de目mu的de是shi排pai濕shi和he降jiang溫wen
，滿man足zu棚peng內nei蔬shu菜cai光guang合he作zuo用yong對dui二er氧yang化hua碳tan的de需xu求qiu。因yin此ci
，通tong風feng換huan氣qi的de時shi間jian一yi般ban應ying在zai棚peng內nei溫wen度du過guo高gao

，相xiang對dui濕shi度du較jiao大da，光guang合he作zuo用yong加jia快kuai時shi進jin行xing，也ye就jiu是shi說shuo在zai晴qing天tian的de上shang午wu揭jie簾lian後hou1—2xiaoshikaishijinxing。lingwai
，zaijiaoshuishifeihuopensanongyaohou，youyushiduzengda
，yeyingduanshitongfeng。erzaiyinxuetianqi
，dangshineixiangduishiduda
，eryanghuatanchuxiankuiquejiyouhaiqitijileideqingkuangxia
，yeyinggaijinxingduanshijianjielianfangxiaofeng，yimanzushucaiduieryanghuatandexuqiu。lingwaiyenengjiangdizhizhutineiyangfenxiaohao
，tigaozhizhukanghannengli。ruyudaojiuyintuqingshi，yaoduipengwaifugaiwujinxingjiangejielian
，fangfengliangyaoxiao

，yifangguangzhaoguoqiang
，zhengtengjiaju，zaochengshucaishishuiweinian。

總之，冬春季節，栽培棚菜通風換氣的學問應綜合應用，積累經驗，有必要經常與農技人員進行谘詢和交流。