AgriculturalApplica,onsofET
AndrewFrench1,CharlesA.Sanchez2,DouglasHunsaker1,PaulBrown2,DawitZerihun2,ClintonWilliams1,EduardoBau,sta1
1.U.S.AridLandAgriculturalResearchCenter,USDA/ARS,Maricopa
2.UniversityofArizona,Tucson
Situa,on
• TheColoradoRiverValleysofSouthernArizonaandCaliforniaAndtheImperialandCoachellaValleysofCaliforniarepresentmoreThan700,000acres(280,000ha)ofirrigatedcropland• Thisregionproducesmorethan95%ofthena,on’svegetablesDuringthefall-winter-springseasoneachyear.• ManyofthewaterrightsonthelowerColoradohavehighseniority• ColoradoRiverresourcesover-subscribed• USBRisresponsiblefordeliveringwater,managingsalinity,andmee,ngUS/Mexicotreatyobliga,ons• RemotesensingofEThasaroleinassessingcurrentwateruse&
helpingtomanagewaterinthefuture.
CoachellaValley
ImperialValleyLowerColoradoRiverValley
Irriga,onDistrictsfortheYumaArizonaRegion
DecliningIrriga,onWaterDeliveriestoYumaCountyFarms
ImprovedWaterManagement
• Laserleveling• Concretelinedditches• Highturnoutgates• Sprinklerirriga,on• Lengthofirriga,onruns,furrowgeometry,andmanipula,onofcutoffdistanceand,me
• Croppingsystemshi_s
YumaCountyCropProduc,onShi_toVegetables
IrrigableAcresinYumaCountyDedicatedtoMul,-CropsIncreased5xsince1970
WaterConserva,onbyReducingSummerMonthCropping
ImprovedWaterManagementPrac,ce:Flood->Sprinkler
Thewaterintensiveprac,ceof“subbing”upvegetablesbymaintainingwaterinfieldfurrowsfor7-10dayshasbeenreplacedbysprinklerirriga,on
FarmManagementPrac,ceshaveIncreasedApplica,on&CropWaterUse
Efficienciesfrom~55%to~75%
AllCrops Leguce
Applica,onEfficiency:CropET/WaterApplied WUE:CropYield/WaterApplied
ElementsofIrriga,onandtheRoleofETMonitoring
• Irriga,onScheduling:TimingandRequiredDepth• AdjustmentofRequiredDepthforSaltManagement(Leaching)• Irriga,onDesignandManagement(Efficient&Uniform
Applica,onofRequiredDepth• Accuracyofwaterusages,llamajorques,on
RoleofRemoteSensingofETforAgriculture
• ETmodelscanreasonablyes,mateseasonalwateruse
• Crop®ionspecificwaterusevaluesforirriga,ondistrictmanagement
• UsefulremotesensingofETneedstobeatdaily,mesteps,<100mresolu,on,andaccessibletofarmersandtheiradvisors.
CropClassifica,on
LSTMaps Cumula,veWaterUsed
VI-BasedET
• ETuses/lossesarethesinglelargestunmeasuredwaterflux• New,updatedwaterusebaselinesneededintheUSSouthwest• Scarcity&Farmvs.UrbanUsers• Salinitymanagement
• KnowledgeofETwouldimprovein-seasonforecas,ngofwaterrequirements• ET-basedtoolswouldbeusedifaccurate,consistent,andeasy-touse
AgriculturalApplica,onsofET
TemperatureResponsesvs.WaterDeficits
Temperaturevs.TimeofDay Surface-AirTemperatureDifferencevs.TimeofDay
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