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Robert Horton
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Distinguished Professor of Agronomy
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About Robert Horton
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Distinguished Professor of Agronomy,
Iowa State University
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Agricultural Science
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Articles
(129)
Article
An Improved Approach for Measurement of Coupled Heat and Water ...
Soil Science Society of America Journal (2007)
J. L. Heitman, R. Horton, T. Ren and T. E. Ochsner
Laboratory experiments on coupled heat and water transfer in soil have been limited in their measurement approaches. Inadequate temperature control ...
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Article
Field Measurement of Soil Surface Chemical Transport Properties for Comparison ...
Soil Science Society of America Journal (2007)
J. L. Heitman, A. Gaur, R. Horton, D. B. Jaynes, et al.
Management of chemicals in soil is important, yet the complexity of field soils limits prediction of management effects on transport. ...
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Article
Improved Analysis of Heat Pulse Signals for Soil Water Flux ...
Soil Science Society of America Journal (2007)
G. J. Kluitenberg, T. E. Ochsner and R. Horton
Soil water flux (J) can be estimated from the velocity (V) of a pulse of heat introduced into the soil. ...
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Article
Soil Heat Flux Plates
Agronomy Journal (2007)
Thomas J. Sauer, Tyson E. Ochsner and Robert Horton
Persistent concern regarding surface energy balance closure encourages increased scrutiny of potential sources of error. Laboratory and field experiments addressed ...
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Article
Soil Heat Storage Measurements in Energy Balance Studies
Agronomy Journal (2007)
Tyson E. Ochsner, Thomas J. Sauer and Robert Horton
Energy balance studies require knowledge of the heat flux at the soil surface. This flux is determined by summing the ...
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Article
A dripper-TDR method for in situ determination of hydraulic conductivity ...
Advances in Water Resources (2006)
Salem A. Al-Jabri, Jaehoon Lee, Anju Gaur, Robert Horton, et al.
Field determined hydraulic and chemical transport properties can be useful for the protection of groundwater resources from land-applied chemicals. Most ...
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Article
Field Tests of the Soil Heat Flux Plate Method and ...
Agronomy Journal (2006)
Tyson E. Ochsner, Thomas J. Sauer and Robert Horton
Heat flux plates are commonly used to measure soil heat flux, a component of the surface energy balance. The plate ...
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Article
Measured and Predicted Solute Transport in a Tile Drained Field
Soil Science Society of America Journal (2006)
Anju Gaur, Robert Horton, Dan B. Jaynes and James L. Baker
Most solute transport measurement techniques are tedious and require extensive soil excavation. A field experiment was conducted to evaluate whether ...
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Article
Method for Maintaining One-Dimensional Temperature Gradients in Unsaturated, Closed Soil ...
Soil Science Society of America Journal (2006)
J. Zhou, J. L. Heitman, R. Horton, T. Ren, et al.
One-dimensional temperature gradients are difficult to achieve in nonisothermal laboratory studies because, in addition to desired axial temperature gradients, ambient ...
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Article
Evaluation of the Heat Pulse Ratio Method for Measuring Soil ...
Soil Science Society of America Journal (2005)
Tyson E. Ochsner, Robert Horton, Gerald J. Kluitenberg and Quanjiu Wang
Soil water flux is an important hydrologic parameter, yet few techniques for measuring it in situ are available. Here we ...
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Article
Can Solid Matrix Priming With GA3 Break Seed Dormancy in ...
Journal of Range Management (2004)
C. Rogis, L. R. Gibson, A. D. Knapp and R. Horton
Development of methods for breaking seed dormancy in eastern gamagrass (Tripsacum dactyloides, L.) could increase its use. Solid matrix priming, ...
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Article
The Effect of Natural Mulches on Crop Performance, Weed Suppression ...
Crop Science (2004)
L. M. Duppong, Kathleen Delate, Matthew Z. Liebman, Robert Horton, et al.
Because of expanding markets for high-value niche crops, opportunities have increased for the production of medicinal herbs in the USA. ...
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Article
Extended methodology for determining wetting properties of porous media
Water Resources Research (2003)
J. Bachmann, S .K. Woche, M.-O. Goebel, M. B. Kirkham, et al.
[1] Because most methods for assessing the wettability of porous materials are restricted in their applicability, we developed two new ...
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Article
Errors in Heat Flux Measurement by Flux Plates of Contrasting ...
Vadose Zone Journal (2003)
T. J. Sauer, D. W. Meek, T. E. Ochsner, A. R. Harris, et al.
The thermal conductivity (λ) of soils may vary by a factor of about 4 for a range of field soil ...
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Article
Use of the Dual-Probe Heat-Pulse Technique to Monitor Soil Water ...
Vadose Zone Journal (2003)
Tyson E. Ochsner, Robert Horton and Tusheng Ren
The dual-probe heat-pulse (DPHP) technique is emerging as a useful technique for measuring soil volumetric water content (θ). However, few ...
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Article
Using Surface Time Domain Reflectometry Measurements to Estimate Subsurface Chemical ...
Vadose Zone Journal (2003)
Anju Gaur, Robert Horton, Dan Jaynes, Jaehoon Lee, et al.
Chemicals that leach through soil pose threats to surface and groundwater quality. It is difficult and expensive to measure subsurface ...
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Article
Diffusion in sparsely connected pore spaces: Temporal and spatial scaling
Water Resources Research (2002)
Robert P Ewing and Robert Horton
[1] Diffusion both disperses and retards mass movement of contaminants through porous media. The retardation generally involves mass transfer of ...
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Article
Field determination of soil hydraulic and chemical transport properties
Soil Science (2002)
Salem A. Al-Jabri, Robert Horton, Dan B. Jaynes and Anju Gaur
Hydraulic and chemical transport properties are the major inputs in predictive models that simulate the movement of water and chemicals ...
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Article
Mathematical analysis of heat pulse signals for soil water flux ...
Water Resources Research (2002)
Quanjiu Wang, Tyson E Ochsner and Robert Horton
[1] Soil water flux is an important parameter in studies of runoff, infiltration, groundwater recharge, and subsurface chemical transport. Heat ...
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Article
A Point-Source Method for Rapid Simultaneous Estimation of Soil Hydraulic ...
Soil Science Society of America Journal (2002)
Salem A. Al-Jabri, Robert Horton and Dan B. Jaynes
Hydraulic and chemical transport properties are needed for accurate prediction of water and chemical movement through the vadose zone. Field ...
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Article
Inverse three-dimensional groundwater modeling using the finite-difference method for recharge ...
Transactions of the ASAE (2002)
V. B. Ella, S. W. Melvin, R. S. Kanwar, L. C. Jones, et al.
Knowledge of groundwater recharge rates is essential for developing sustainable groundwater resources management schemes and for assessing the susceptibility of ...
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Article
Temperature Dependence of Water Retention Curves for Wettable and Water-Repellent ...
Soil Science Society of America Journal (2002)
J. Bachmann, R. Horton, S. A. Grant and R. R. van der Ploeg
The capillary pressure (ψ) in unsaturated porous media is known to be a function of temperature (T). Temperature affects the ...
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Article
The Feasibility of Shallow Time Domain Reflectometry Probes to Describe ...
Soil Science Society of America Journal (2002)
Jaehoon Lee, Robert Horton and Dan B. Jaynes
Rapid and nondestructive methods for determining solute transport properties are useful in many soil science applications. Recently, a series of ...
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Article
Characterization of preferential flow in undisturbed, structured soil columns using ...
Journal of Contaminant Hydrology (2001)
J. Lee, R. Horton, K. Noborio and D. B. Jaynes
Rapid movement of agricultural chemicals through soil to groundwater via preferential flow pathways is one cause of water contamination. Previous ...
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Article
Evaluation of a Simple Method for Estimating Solute Transport Parameters ...
Soil Science Society of America Journal (2000)
Jaehoon Lee, Dan B. Jaynes and Robert Horton
A two-domain, physical nonequilibrium solute transport model has been used to describe the transport and fate of solute in soil. ...
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