农用薄膜是应用于农业生产的塑料薄膜的(de)(de)(de)总称,对(dui)于播种时期的(de)(de)(de)保湿(shi)、保温起非常(chang)重(zhong)要的(de)(de)(de)作用(yong)(yong)(yong)。随着科学技术的(de)(de)(de)进(jin)步,对(dui)农(nong)(nong)用(yong)(yong)(yong)薄(bo)(bo)(bo)膜(mo)(mo)(mo)的(de)(de)(de)要求(qiu)越来越高,各(ge)种新型薄(bo)(bo)(bo)膜(mo)(mo)(mo)不断出(chu)现,现介绍几种先(xian)进(jin)的(de)(de)(de)农(nong)(nong)用(yong)(yong)(yong)薄(bo)(bo)(bo)膜(mo)(mo)(mo)。这种薄(bo)(bo)(bo)膜(mo)(mo)(mo)厚度只(zhi)有普通(tong)薄(bo)(bo)(bo)膜(mo)(mo)(mo)的(de)(de)(de)一半(ban),因此重(zhong)量(liang)(liang)减轻一半(ban),相应(ying)(ying)的(de)(de)(de)使用(yong)(yong)(yong)成(cheng)本也降低(di)一半(ban)。它(ta)的(de)(de)(de)透光度和(he)保温性(xing)也优(you)于普通(tong)薄(bo)(bo)(bo)膜(mo)(mo)(mo),每吨可覆盖耕地436亩(mu),为(wei)普通(tong)农(nong)(nong)膜(mo)(mo)(mo)的(de)(de)(de)2倍;此种薄(bo)(bo)(bo)膜(mo)(mo)(mo)除用(yong)(yong)(yong)做(zuo)水(shui)稻、棉花、玉米、烤(kao)烟、花卉的(de)(de)(de)育苗(miao)和(he)大田覆盖外,还利用(yong)(yong)(yong)它(ta)做(zuo)防(fang)(fang)洪膜(mo)(mo)(mo),为(wei)灌(guan)渠和(he)贮(zhu)水(shui)池做(zuo)内衬,大大提高水(shui)的(de)(de)(de)利用(yong)(yong)(yong)系数(shu)。除此以外,农(nong)(nong)膜(mo)(mo)(mo)还广泛应(ying)(ying)用(yong)(yong)(yong)于食用(yong)(yong)(yong)菌(jun)栽培、贮(zhu)藏青饲料等;为(wei)使薄(bo)(bo)(bo)膜(mo)(mo)(mo)耐老化、易回收,在(zai)生(sheng)产(chan)过程中加入防(fang)(fang)老化剂(ji),可使薄(bo)(bo)(bo)膜(mo)(mo)(mo)的(de)(de)(de)寿命延长2~4倍。地膜(mo)(mo)(mo)在(zai)揭膜(mo)(mo)(mo)后仍(reng)有一定(ding)强度,回收后仍(reng)可使用(yong)(yong)(yong),既降低(di)成(cheng)本、又(you)减少(shao)田间的(de)(de)(de)残膜(mo)(mo)(mo)量(liang)(liang)。
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