覆(fu)蓋(gai)農膜是(shi)(shi)一(yi)種(zhong)(zhong)(zhong)覆(fu)蓋(gai)于地(di)(di)表之(zhi)上(shang)的(de)(de)塑料(liao)農膜產品(pin)(pin),與地(di)(di)膜相似(si),但與地(di)(di)膜不(bu)同的(de)(de)是(shi)(shi),覆(fu)膜是(shi)(shi)覆(fu)于農作(zuo)物(wu)表面(mian)(mian)的(de)(de)一(yi)種(zhong)(zhong)(zhong)塑料(liao)薄(bo)(bo)膜產品(pin)(pin),地(di)(di)膜是(shi)(shi)覆(fu)于地(di)(di)表之(zhi)上(shang)的(de)(de)一(yi)種(zhong)(zhong)(zhong)塑料(liao)薄(bo)(bo)膜產品(pin)(pin)。地(di)(di)膜看上(shang)去薄(bo)(bo)薄(bo)(bo)一(yi)層,但作(zuo)用相當(dang)大。不(bu)僅(jin)能(neng)夠提高(gao)地(di)(di)溫、保(bao)水、保(bao)土、保(bao)肥提高(gao)肥效,而且還有(you)滅草、防病蟲、防旱抗(kang)澇、抑鹽(yan)保(bao)苗、改進近(jin)地(di)(di)面(mian)(mian)光(guang)熱條(tiao)件(jian),使產品(pin)(pin)衛生(sheng)清潔等(deng)多項功能(neng)。對于那些剛出土的(de)(de)幼苗來說(shuo),具有(you)護根促長等(deng)作(zuo)用。對于我國三北地(di)(di)區,低溫、少雨、干(gan)旱貧脊、無(wu)霜期短(duan)等(deng)限制農業發展的(de)(de)因素,具有(you)很(hen)強的(de)(de)針對性和適用性,對于種(zhong)(zhong)(zhong)植二季水稻育(yu)秧(yang)及多種(zhong)(zhong)(zhong)作(zuo)物(wu)栽培上(shang)也起(qi)了作(zuo)用。在全國31個省(sheng)市自(zi)治區普及和應用,用于糧(liang)、棉(mian)、油、菜、瓜(gua)果、煙、糖、藥、麻(ma)、茶(cha)、林等(deng)40多種(zhong)(zhong)(zhong)農作(zuo)物(wu)上(shang),使作(zuo)物(wu)普遍(bian)增產30%-50%,增值(zhi)40%-60%,深受廣大農民的(de)(de)歡迎。