soil moisture

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Water PotentialINSTRUMENT RANGESSTUDYLABORATORY INSTRUMENTSFIELD INSTRUMENTSMEASUREPressurePlate*HyPropTensiometerPlant Water StudiesEcological StudiesSoil Water & FlowIrrigation ManagementExpansive SoilsVSAPermanent WiltingPoint (-1.5 MPa)WP4CDewPointGranularMatricHeatDissipationMPS-2-1 kPa-10 kPa-100 kPa-1 MPa-10 MPa-100 MPa-1000 MPaHypoxia Plant Available Water Air DryOven DryExcellent accuracy.Good accuracy.Moderate accuracy.Responds to change, may not be accurate.Useful in some applications.Not recommended or out of range.33*Assumes equilibrium time 1-3 months.
Growth LimitsZoosporemovementceasesMotility ofbacteriaceasesMeanminimum tosupportbacterial growthLower limit ofplant availablewaterMicrocoleusgrowthinhibitedMicrocoleusphotosynthesisinhibitedNitrification andsulphur oxidationceaseBacterialrespirationceasesPseudomonasetc. inhibitedMICROORGANISMSpF*MPaWATER POTENTIALa WWATER ACTIVITY2.7 -0.05 0.99963.2 -0.14 0.99903.9 -0.70 0.99494.2 -1.50 0.98914.3 -1.80 0.98694.5 -2.80 0.97984.6 -4.20 0.96984.7 -5.00 0.96424.9 -7.03 0.9500Salmonella,some moldsinhibitedMany yeastsinhibited5.1 -12.92 0.91005.3 -19.08 0.8700Most moldsinhibitedMost halophiticbacteriainhibitedXerophilic moldsinhibited5.5 -30.57 0.80005.6 -39.41 0.75005.8 -59.02 0.6500All microbialproliferationceases5.9 -69.98 0.6000The biological limits are taken from L.R. Beuchat, Cereal Foods World,26:345 (1981) and M. Potts, Microbiological Reviews, 58:768 (1994).*pF is the base 10 logarithm of the water potential in cm34
Page 1: new Instruments Available. Details
Page 4 and 5: PorometerResearch forEveryoneHigh q
Page 6 and 7: PhotosyntheticallyActive Radiation
Page 8 and 9: Built-to-orderLeaf WetnessSensorDet
Page 10 and 11: Soil Moisture SystemsBig Networks f
Page 12 and 13: Soil Moisture SensorsMeasurement &
Page 14 and 15: Data LoggersSpend more time with yo
Page 16 and 17: Complete Soil MoistureAnalysis- Dat
Page 18 and 19: Manage IrrigationWithout Leaving Yo
Page 21 and 22: Essential Water Potential DataMake
Page 23 and 24: Measure SoilHydraulicConductivityQu
Page 25: Information Measurements Evaluation
Page 28 and 29: MonitorGroundwaterLeachingMeasure D
Page 31 and 32: Measure Conductivity,Temperature, a
Page 33 and 34: Vacuum SystemsTensiometer control e
Page 35: THERMAL32
Page 39 and 40: Support & Service509-332-5600suppor

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