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1、本科毕业（设计）论文外文文献翻译学院：城乡建设学院专业班级：农业水利工程0901班Water-savingirrigation1.Existingwater-savingirrigationmethodsIrrigationmethods,fieldwaterdistributionmethodishowtohavebeensenttothefarms,theirrigationwaterisevenlydistributedtotheactivelayerofthecroproot.Irrigationwater
2、isthemeansbywhichtoentertheactivelayerofroots,irrigationmethodscanbedividedintosurfaceirrigation,sprinklerirrigation,micro-irrigationandundergroundirrigation.1.1surfaceirrigationSurfaceirrigationisanancienttraditionalirrigationmethod,ingeneral,itisascomparewhe
3、therwater-savingbasispoints.Surfaceirrigationtechnologyareconstantlydevelopandconstantlyimprove,sotherearemanymorewater-efficientthantraditionalsurfaceirrigationtechnology.1.1.1newfurrowirrigationtoolsTraditionalfurrowirrigationwithartificialopeningfromthedist
4、ributionchannelwaterintothefurrow,itisneitheraccurateandinconvenient,andoftencausethefieldofwaterlossduetowaterportleakagecountrieshavealreadyadoptedthesiphon(foropenchannelwater)orgateholepipe(aqueduct)drainage,Chinahasdoneanumberoftests,proventoimprovefieldw
5、aterutilizationrateof5%to10%.1.1.2surgeirrigationModernforeigndevelopedwaveChung(groove)borderirrigationorintermittentditch(furrow)irrigation,trafficcontrolintotheditch(furrow)isintermittentwaterandthenputaperiodoftime(afewminutesortensofminutes)tofieldstopthe
6、waterforsometime(afewminutesortensofminutes),andsoforth,sothatyoucanmakealongtheditch(furrow)thelengthdirectionofthewaterdistributionismoreuniform.Fieldsofwaterutilizationupto80%to90%.Filmholeirrigation(alsoknownasthefilmholeirrigation)Gully,madeonthefilmofwat
7、erflowinthemembrane,cropsgrowholetopenetratetheland,sothatirrigationefficiencyishigh,generallywater-saving25%to35%,anincreaseof15%to20%,theydonotspecificallyfacilities.1.2IrrigationSprinklertospraythroughtheair,duetothepressureofthecommonlyusedpressureaqueduct
8、.Ingeneral,itsobviousadvantagesirrigationuniformity,lessoffarmland,savemanpower,strongadaptabilitytotheterrain.Themaindisadvantageisinfluencedbywind,highinvestmentinequipment.Morei
