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RESEARCH PERSONNEL

Dr. David K. Brauer
Research Leader
Research Agronomist
(806) 356-5769
david.brauer@ars.usda.gov
RESEARCH INTERESTS

Efficient use of water in irrigated and dryland agriculture:

  • Effects of dryland management practices on crop productivity and water availability
  • The interaction between land use and hydrological processes of the southern Great Plains
  • The interaction between water policies and availability on agricultural production
Dr. R. Louis Baumhardt
Research Soil Scientist
(806) 356-5766
r.louis.baumhardt@ars.usda.gov
RESEARCH INTERESTS

Efficient use of water in dryland agriculture:

  • Residue Management for Soil and Water Conservation
  • Dryland Crop Rotations and Sequences
  • Integrated Livestock and Row Crop Production Systems
  • Computer Crop Growth Modeling
  • Rain Infiltration and Field Hydrology
Dr. Paul D. Colaizzi
Research Agricultural Engineer
(806) 356-5763
paul.colaizzi@ars.usda.gov
RESEARCH INTERESTS

Efficient use of water in irrigated agriculture:

  • Remote sensing (regional, farm, and site-specific crop management)
  • Evapotranspiration (energy balance, water balance)
  • Irrigation scheduling (models, water management)
  • Lysimeters
  • Subsurface drip irrigation
  • Mechanical-move irrigation systems
  • Site specific irrigation system design for precision agriculture
Dr. Steven R. Evett
Research Soil Scientist
(806) 356-5775
steve.evett@ars.usda.gov

 

RESEARCH INTERESTS

Efficient use of water in irrigated agriculture:

  • Energy and Water Balances and Fluxes in the Soil-Plant-Atmosphere Continuum
  • Irrigation Effects on Surface Energy Balance and Evaporative Losses (Sprinkler and Microirrigation)
  • Soil Physical Property Effects on Plant Water Use
  • Irrigation Scheduling
  • Lysimeters for Measurement of ET and Water Quality
  • Irrigation Scheduling (models, water management)
  • Soil Water Measurement Methods (time domain reflectometry, neutron scattering, frequency domain, coring, etc.)
  • Weather Networks
  • Soil Physical Property Measurement Methods (tension and positive head infiltrometry, desorption methods)
Dr. Prasanna H. Gowda
Research Agricultural Engineer
(806) 356-5730
prasanna.gowda@ars.usda.gov
RESEARCH INTERESTS

Efficient use of water in irrigated and dryland agriculture:

  • Hydrologic Modeling (surface and ground water)
  • Regional Water Use Budget
  • Evapotranspiration (ET)
  • GIS and Remote sensing (Rainfall estimation, ET and Crop Residue Cover Mapping)
  • Crop Residue Management for Soil and Water Conservation
  • Water Quality (Drainage, soil and nutrient losses)
  • Precision Farming
Dr. Gary Marek
Research Agricultural Engineer
(806) 356-5717
gary.marek@ars.usda.gov
RESEARCH INTERESTS

Efficient use of water in irrigated and dryland agriculture:

  • Hydrologic Modeling (SWAT, APEX, & RZWQM)
  • Water Quality (Drainage, soil, and nutrient losses)
  • Evapotranspiration (ET)
  • Lysimeters
  • Weather Networks
Dr. Susan A. O'Shaughnessy
Research Agricultural Enginerr
(806) 356-5770
susan.oshaughnessy@ars.usda.gov
RESEARCH INTERESTS

Efficient use of water in irrigated agriculture:

  • Center Pivot Automation
  • Precision Irrigation Feedback and Control
  • Time-Temperature_Threshold (TTT) Method of Irrigation Scheduling
  • Canopy Temperature Based Water Stress Indicies
  • Irrigation efficiency
Dr. Robert C. Schwartz
Research Soil Scientist
(806) 356-5762
robert.schwart@ars.usda.gov
RESEARCH INTERESTS

Efficient use of water and nutrients in dryland agriculture:

  • Influence of soil structure on water flow and solute transport
  • Methods for the measurement of soil hydraulic properties
  • Influence of soil physical properties on infiltration and water balance
  • Nutrient management strategies for land application of stockpiled manure to dryland crops
  • Phosphorous loading and transport on agricultural soils
  • Influence of tillage and cropping systems on soil properties
  • Use of the numerical method of lines to solve water, heat, and solute transport PDE's
Dr. Judy A. Tolk
Research Plant Physiologist
(806) 356-5736
judy.tolk@ars.usda.gov
RESEARCH INTERESTS

Efficient use of water in irrigated agriculture:

  • Plant Response to Water Stress
  • Plant-Soil-Water Interactions
  • Plant-Water Relations Measurements (transpiration, photosynthesis, leaf water relations)
  • Evapotranspiration Partitioning (evaporation, E, and transpiration, T)
  • Lysimeters for Measurement of ET
  • Micrometeorological Measurements
Karen S. Copeland
Soil Scientist
(806) 356-5735
karen.copeland@ars.usda.gov
RESEARCH INTERESTS

Efficient use of water in irrigated agriculture:

  • Evapotranspiration (energy balance, water balance)
  • Lysimeters
  • Irrigation Scheduling (models, water management)
  • Weather Networks
Brice B. Ruthardt
Biological Scientist
(806) 356-5780
brice.ruthardt@ars.usda.gov
RESEARCH INTERESTS

Efficient use of water in irrigated agriculture:

  • Evapotranspiration (lysimeters & water balance measures)
  • Irrigation automation
  • Soil water sensor development and comparison
  • Sensor Networks

Support Personnel

Luke Britten , Agriculture Sci. Research Technician, luke.britten@ars.usda.gov
Gwen Coyle , Agriculture Sci. Research Technician, gwen.coyle@ars.usda.gov
Beau Hiltbrunner , Agriculture Sci. Research Technician, beau.hiltbrunner@ars.usda.gov
Edwin Hutcherson , Biological Sci. Technician, ed.hutcherson@ars.usda.gov
Grant Johnson , Biological Sci. Technician grant.johnson@ars.usda.gov
Don McRoberts , Biological Sci.Technician, don.mcroberts@ars.usda.gov
Sharon Parkhurst , Program Support Assistant, sharon.parkhurst@ars.usda.gov.gov