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1、《节水灌溉技术》形成性考核册作业答案（Watersavingirrigationtechnologyformativeassessmentbookoperationanswers）"Watersavingirrigationtechnology"formativeassessmentbookoperationanswers1:accordingtotheamountofrainfall,Chinaisdividedintofiveprecipitationzones:(1)rainbelt:annualrainfallofmore
2、than1600mm,richrice,tropicalandsubtropicalcrops,isthemainproducingareasofChinaindoublecroppingrice.(2)humidzone:annualrainfallover800~1600mm,isthemainproducingareaofriceinChina,aswellaswinterwheat,rapeandothercrops.(3)semihumidzone:theannualrainfallis400~800mm,whichis
3、themainwheat,cottonandotherdrycropareasinchina.(4)semi-aridzone:annualrainfallof200~400mm,mainlyforpastoralareas.(5)aridzone:annualrainfalllessthan200mm,almostnoagriculture.2,agriculturalwater-savingtechnologyincludingwater-savinganddroughtresistantcropvarieties,cover
4、ingtechnology,water-savingcultivationtechnology,adjustmentofcropplantingstructure,soilmoisture,waterretainingagentapplication.3.Currentsituationanddevelopmenttrendofwater-savingirrigationtechnologyinchina:(1):thedevelopmentofcanalseepagecontroltechnologyhasgoodperform
5、ance,lowprice,easyconstructionmaterials,thedevelopmentofanumberofconstructionmachinery;thereislininginhighcost,sometechnicalproblemsneedtoimprove,constructionmachineryperformance,typeless;(2)lowpressurepipelinetechnology,madecertainachievementsintechnologyanddeveloped
6、anumberofsuitablematerials,equipmentandconstructiontechnology;problemsaremainlymaterials,equipmentandtechnologyneedsfurtherimprovementandresearch;(3):sprinklerirrigationtechnologyhasacertainscale,developedavarietyofsprinklerirrigationequipmentandcompleteproduction;pro
7、blemsaresprinklerirrigationmaterials,equipmentqualityandperformancetypeofdistance,thereisalargegapbetweentheadvancedlevel,durable,technologyandmanagementlevelisrelativelylow;(4)improvingsurfaceirrigationtechnology:BasedonourrealityUsingmanyimprovedmethods,achievements
8、;problemsisthelackoftechnology,equipment,fieldmethodcanbepopularizedinlargeareaofland;(5):ricewater-savingirrigationhasbeens
