University of Nebraska Carbon Sequestration Program
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Soil Moisture Monitoring and Modeling in the Nebraska Carbon
Sequestration Project Kenneth G. Hubbard Todd T. Schimelfenig and
Cynthia J. Hays University of Nebraska Carbon Sequestration
Program
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University of Nebraska Carbon Sequestration Program Objective
To provide continuous measurements of rainfall, irrigation and
root-zone soil water for the overall study on carbon sequestration
and real-time data for use in irrigation management
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University of Nebraska Agricultural Research Development Center
Ithaca NE 1.Continuous irrigated maize 2.Irrigated maize/soybean
rotation 3.Rain fed maize/soybean rotation
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University of Nebraska Carbon Sequestration Program
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University of Nebraska Carbon Sequestration Program SYSTEM
COMPONENTS Free Wave spread spectrum wireless data transceiver
Campbell Scientific datalogger Theta-probe soil moisture sensor
Tipping bucket rain gauge
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University of Nebraska Carbon Sequestration Program
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University of Nebraska Carbon Sequestration Program
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University of Nebraska Carbon Sequestration Program
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University of Nebraska Carbon Sequestration Program
www.hprcc.unl.edu/soilm/home.html
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University of Nebraska Carbon Sequestration Program
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University of Nebraska Carbon Sequestration Program
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University of Nebraska Carbon Sequestration Program
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University of Nebraska Carbon Sequestration Program
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(Mahmood and Hubbard, 2003) University of Nebraska Carbon
Sequestration Program S/t = p + I - ET - R o - D r S = v z, the
equivalent depth of water in the soil z = layer depth v =
volumetric water content t = time p = precipitation I = irrigation
ET = evapotranspiration R o = runoff D r = drainage
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University of Nebraska Carbon Sequestration Program
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University of Nebraska Carbon Sequestration Program Conclusions
Theta probes should be calibrated for each soil type It is
important to include calibration set-points that are near the end
of the range (wilting point & field capacity) Clay soils
present considerable challenge because of swelling, shrinking, and
cracking Quick disconnects and buried tubes ensure that sensors in
agricultural fields are undisturbed from year-to-year
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THE END
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University of Nebraska Carbon Sequestration Program
