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1、《节水灌溉技术》形成性考核册作业答案（Theanswertotheformationassessmentofwater-savingirrigationtechnology）Theanswertotheformationassessmentofwater-savingirrigationtechnology1.Accordingtotheamountofrainfall,Chinaisdividedintofiveprecipitationzones:(1)rain-belt:morethan1600mma
2、nnualrainfall,richinrice,tropicalandsubtropicaleconomiccrops,isthemainproductionareaofChina'sdouble-seasonrice.(2)humidzone:annualrainfallexceeds800~1600mm,whichisthemainproductionareaofriceinChina,andwinterwheat,rapeseedandothercrops.(3)semi-humidzone:the
3、annualrainfallof400~800mmisthemainwheat,cottonandotherdrought-producingareasinChina.(4)semi-aridzones:200to400mmannualrainfall,mainlyforpastoralareas.(5)droughtbelt:lessthan200mmannualrainfall,almostnoagriculture.Agriculturalwater-savingtechnologiesinclude
4、thevarietiesofdroughtresistantandwater-savingcrops,covertechnologies,water-savingtechniques,theadjustmentofcropplantingstructures,theuseofmoistureandwaterretentionagents,etc.3.Currentsituationanddevelopmenttrendofwater-savingirrigationtechnologyinChina:(1)
5、channelanti-seepagetechnology:withthedevelopmentofgoodperformance,lowpriceandeasyconstructionmaterials,abatchofconstructionmachinerywasdeveloped.Theproblemisthattheliningcostishigher,sometechnicalproblemsneedtobeimproved,theconstructionmachineryperformance
6、ispoor,themodelisless;(2)low-pressurepipelinewaterinfusiontechnology:acertainsetoftechnicalachievementshavebeenobtained,andsomematerials,equipmentandconstructiontechniquessuitableforthenationalconditionshavebeendeveloped.Theproblemsaremainlymaterials,equip
7、mentandtechnologiesthatneedtobefurtherimprovedandstudied.(3)sprayingmicro-irrigationtechnology:ithasacertainscale,andhasdevelopedavarietyofsprayingmicro-irrigationequipmentandcompleteproduction;Theproblemisthatthequality,thequality,theperformanceoftheequip
8、mentandtherangeoftheadvancedlevelofthesprayingmicro-irrigationmaterialshavealargegap,notdurable,andthetechnologyandmanagementlevelarelow.(4)improvedgroundirrigationtechnology:combinedwithpracticalChina,manyim
