(2)加強雹情預報 雹災具有偶發性,因而進行預防有一定難度。冰雹的形成又有明顯氣象特點,所以進行預報、yufangyoushikenengde。yaoyouxiaodifangbaojianzai,bixuzhuyijiangbaoyubao,zhuyijiangbaofashengzhengzhaodeyanjiu。yingjijichuangzaotiaojiancaiyongxiandaiyiqishebeishibiebingbaoyun,tigaojiangbaoyubaodejishixinghezhunquelv。baozaiduiguoshideweihaishiguoshiyuedaweihaiyuezhong。yincizaiguoshipengdahouyingtebiezhuyiyubao,yibianjishicaiqufangbaojianzaicuoshi。
(3)人工防雹 ①爆炸法:近年來,我國雹區各地普遍推廣了空炸炮和土追擊炮,可發射至300~1000migaodu,yeyouxiediquzhizaolegezhongleixingdehuojian,shiyonggaoshepaofashedaojiqianmigaokong。baozhashichanshengdechongjibonengyingxiangbingbaoyundeqiliu,shibingbaoyungaibianyidongfangxiang,yeshiguolengdeshuididongjie,congeryizhibinglizengchang,shixiaobingbaoronghuaweiyu。②化學催化法:利用火箭或高射炮把帶有催化劑(碘化銀)的彈頭射入冰雹雲的過冷卻區,藥物的微粒起了冰核作用。過多的冰核分食過冷水而不讓雹粒長大或拖延冰雹的增長時間。
(4)果實套袋 果(guo)實(shi)套(tao)袋(dai)是(shi)優(you)質(zhi)果(guo)品(pin)生(sheng)產(chan)的(de)一(yi)項(xiang)重(zhong)要(yao)措(cuo)施(shi),也(ye)是(shi)減(jian)輕(qing)雹(bao)災(zai)損(sun)失(shi)的(de)有(you)效(xiao)方(fang)法(fa)。據(ju)調(tiao)查(zha),在(zai)雹(bao)災(zai)嚴(yan)重(zhong)到(dao)好(hao)果(guo)率(lv)為(wei)零(ling)的(de)情(qing)況(kuang)下(xia),套(tao)袋(dai)與(yu)不(bu)套(tao)袋(dai)相(xiang)比(bi),殘(can)果(guo)率(lv)低(di)9.9個百分點,仍有5%haoguo,mingxiandijianqinglesunshi。zaiyifashengbaozaidediqu,shuguodingguoshigengyingliuyouyudi,xiujianshiyeyaoshidangduobaoliuxiezhiye。shiduzengjiazhiyemidu,kexiangduijianqingbaozai。
(5)使用防雹網 防雹網是在果園上方和周邊架設專用的尼龍網或鉛絲網,阻擋冰雹衝擊從而起到保護果樹的作用。
(6)植樹造林 植樹造林可減輕午後的增溫作用,降低風速,防止或減輕冰雹危害。蘋果產區應於建果園的同時在果園四周植樹營造防護林。王金政 薛曉敏
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