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1、《节水灌溉技术》形成性考核册作业答案（Water-savingirrigationtechnologyformativeassessmentBookhomeworkanswer）"Water-savingirrigationtechnology"formativeassessmentBookhomeworkanswer1,accordingtotheamountofrain,ourcountryisdividedintofiveprecipitationzone:(1)rainbelt:annualrainfallofmoret
2、han1600mm,richrice,tropicalandsubtropicalcrops,isthemainproducingareasofChinaindoublecroppingrice.(2)humidzone:theannualrainfallismorethan800~1600mm,isthemainproducingareasofriceinChina,andwinterwheat,rapeandothercrops.(3)semihumidzone:theannualrainfall400~800mm,isCh
3、ina'smajorwheat,cottonandothercropsindryareas.(4)semiaridzone:theannualrainfall200~400mm,mainlyforthepastoralarea.(5)aridzone:theannualrainfallislessthan200mm,almostnoagriculture.2,agriculturalwater-savingtechnologyincludingwater-savinganddroughtresistantcropvarietie
4、s,coveringtechnology,water-savingcultivationtechnology,adjustmentofcropplantingstructure,soilmoisture,waterretainingagentapplication.3,China'scurrentsituationanddevelopmenttrendofwater-savingirrigationtechnology:(1):thedevelopmentofcanalseepagecontroltechnologyhasgoo
5、dperformance,lowprice,easyconstructionmaterials,thedevelopmentofanumberofconstructionmachinery;thereislininginhighcost,sometechnicalproblemsneedtoimprove,constructionmachineryperformance,typeless;(2)lowpressurepipelinetechnology,madecertainachievementsintechnologyand
6、developedanumberofsuitablematerials,equipmentandconstructiontechnology;problemsaremainlymaterials,equipmentandtechnologyneedsfurtherimprovementandresearch;(3):sprinklerirrigationtechnologyhasacertainscale,developedavarietyofsprinklerirrigationequipmentandcompleteprod
7、uction;problemsaresprinklerirrigationmaterials,equipmentqualityandperformancetypeofdistance,thereisalargegapbetweentheadvancedlevel,durable,technologyandmanagementlevelisrelativelylow;(4)improvingsurfaceirrigationtechnology:BasedonourrealityUsingmanyimprovedmethods,a
8、chievements;problemsisthelackoftechnology,equipment,fieldmethodcanbepopularizedinlargeareaofland;(5):ricewater-savingirrigationhasb
