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1、《节水灌溉技术》形成性考核册作业答案"Watersavingirrigationtechnology"formativeexaminationbookoperationanswers1:accordingtotheamountofrainfall,Chinaisdividedintofivezonesofprecipitation:(1)rainbelt:annualrainfallofmorethan1600mm,richrice,tropicalandsubtropicalcrops,isthemainproducingareas
2、ofChinaindoublecroppingrice.(2)humidzone:annualrainfallover800~1600mm,isthemainriceproducingareasinChina,aswellaswinterwheat,rapeandothercrops.(3)semihumidzone:theannualrainfallis400~800mm,whichisthemainwheat,cottonandotherdrycropareasinchina.(4)semi-aridzone:annualrain
3、fallof200~400mm,mainlyinpastoralareas.(5)aridzones:annualrainfalloflessthan200mm,almostnoagriculture.2,agriculturalwater-savingtechnologyincludingwater-savinganddroughtresistantcropvarieties,coveringtechnology,water-savingcultivationtechnology,adjustmentofcropplantingst
4、ructure,soilmoisture,waterretainingagentapplication.3、currentsituationanddevelopmenttrendofwater-savingirrigationtechnologyinchina:(1):thedevelopmentofcanalseepagecontroltechnologyhasgoodperformance,lowprice,easyconstructionmaterials,thedevelopmentofanumberofconstructio
5、nmachinery;thereislininginhighcost,sometechnicalproblemsneedtoimprove,constructionmachineryperformance,typeless;(2)lowpressurepipelinetechnology,madecertainachievementsintechnologyanddevelopedanumberofsuitablematerials,equipmentandconstructiontechnology;problemsaremainl
6、ymaterials,equipmentandtechnologyneedsfurtherimprovementandresearch;(3):sprinklerirrigationtechnologyhasacertainscale,developedavarietyofsprinklerirrigationequipmentandcompleteproduction;problemsaresprinklerirrigationmaterials,equipmentqualityandperformancetypeofdistanc
7、e,thereisalargegapbetweentheadvancedlevel,durable,technologyandmanagementlevelisrelativelylow;(4)improvingsurfaceirrigationtechnology:BasedonourrealityUsingmanyimprovedmethods,achievements;problemsisthelackoftechnology,equipment,fieldmethodcanbepopularizedinlargeareaofl
8、and;(5):ricewater-savingirrigationhasbeensuccessfullyachieved"largeareathinshallowwetdry"irrigationcontrol,the
