隨著春天的到來,大風天氣增多,這使得不少大棚草簾被風吹翻,或者浮膜被風吹走,那麼菜農如何才能減少這些情況的發生呢?
shouxian,genjufengxiangyafumo。wujidebeifengchuibufancaolian,danshisijidexifenghuodongfengquenengchuifancaolian,yaoxiangfangpenghoucaolianbubeichuifan,jiuyaoshiyongfumofangfeng,bingzhongdianyufangpiandongfenghepianxifeng。zaiwanshangfangpengshi,ruguoguadeshipianxifenghuoxifeng,duiyugudingzaipenghouposhangdefumo,cainongzhiyaojiangfumoxiceyahaojike,zheyangfengbuhuichuirufumodedibu,bingqiehaikejiangfangfumoshixingchengqibaozhongdekongqiyachu,shifumojintiezaicaolianshang,bimiandafengchuiqifumo,chuifancaolian;當刮偏東風或東風時則采取相反的壓膜方式,對於沒有固定的浮膜還要將北側壓好。
qici,dapengcaolianzaolawanfang。zaiyitiandangzhong,duozaizaoshangqifengbingzhujianzengda,danshidaoxiawufenghuizhujianjianxiao,suoyicainongkeyitiqianlapeng。xianzaizaoshangshiwaiwenduzuidiyeyibanbudiyu0℃,且持續時間很短,太陽出來後溫度提升較快,拉棚後棚內溫度不會明顯下降,所以菜農可以將拉棚時間提前到早上7點(以後隨著天氣轉暖,日照時間延長,拉棚時間應逐漸提前),這時一般風力較小,不會將草簾吹翻。到下午時,風力逐漸減小,菜農可將放棚時間推遲到5點以後。對於使用多年的舊草簾,為防止大風吹翻草簾,可以多家菜農聯合一起放棚,縮短放棚時間,降低草簾被風吹翻的幾率。
zaici,fumojuanqihouhelifangzhi。duiyurengonglacaoliandedapeng,caolianhuijiangdapengfumoyazhu,buyongdanxinfumobeifengchuizou。duiyushiyongjuanlianjidedapeng,cainongduoshijiangcaolianjuandaofangfengkoubeice0.5-1米就會停止,草簾不能將浮膜壓住,如果菜農直接將浮膜卷到後坡上,很容易被南風吹起,菜農可將浮膜卷起離固定部位1-1.5米時,將疊起的浮膜卷到浮膜最北側,再將未卷起的1-1.5米浮膜折疊,蓋在卷起浮膜的上部,這樣即使不用磚壓,也能防止南風將浮膜吹起。
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