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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
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Articles
(129)
Article
Bulk Density Effects on Soil Hydrologic and Thermal Characteristics: a ...
Hydrological Processes (2018)
Yuki Kojima, Joshua L. Heitman, Masaru Sakai, Chihiro Kato, et al.
Soil bulk density (ρb) is commonly treated as static in studies of land surface dynamics. Magnitudes of errors associated with ...
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Article
Summary of Thermo–Time Domain Reflectometry Method: Advances in Monitoring ...
Soil Science Society of America Journal (2018)
Yili Lu, Xiaona Liu, Meng Zhang, Joshua Heitman, et al.
Soil bulk density (ρb) is a key indicator of soil compaction and soil health that relates to water infiltration, plant ...
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Article
Sensitivity analysis of temperature changes for determining thermal properties of ...
Cold Regions Science and Technology (2018)
Yuki Kojima, Joshua Heitman, Kosuke Noborio, Tusheng Ren, et al.
Determining thermal conductivity (λ) and volumetric heat capacity (C) of partially frozen soils with a dual probe heat pulse (DPHP) ...
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Article
An Empirical Model for Estimating Soil Thermal Diffusivity from Texture ...
Journal of Hydrometeorology (2018)
Xiaoting Xie, Yili Lu, Tusheng Ren and Robert Horton
Soil thermal diffusivity κ is an essential parameter for studying surface and subsurface heat transfer and temperature changes. It is ...
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Article
Portable canopy chamber measurements of evapotranspiration in corn, soybean, and ...
Agricultural Water Management (2018)
Chenyi Luo, Zhuangji Wang, Thomas J. Sauer, Matthew J. Helmers, et al.
Evapotranspiration (ET) is a vital component of a field water balance. Canopy chambers are a promising method for determining crop ...
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Article
Canopy Chamber Measurements of Carbon Dioxide Fluxes in Corn and ...
Vadose Zone Journal (2018)
Zhuangji Wang, Chenyi Luo, Thomas J. Sauer, Matthew J. Helmers, et al.
Crop canopy CO2 exchange rate (CER) includes crop photosynthesis and soil/plant respiration. A portable canopy chamber is effective in determining ...
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Article
Derivation of an Explicit Form of the Percolation-Based Effective-Medium Approximation ...
Water Resources Research (2018)
Morteza Sadeghi, Behzad Ghanbarian and Robert Horton
Thermal conductivity is an essential component in multi-physics models and coupled simulation of heat transfer, fluid flow and solute transport ...
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Article
Estimating the Contribution of Groundwater to the Root Zone of ...
Vadose Zone Journal (2018)
Yonghua Zhu, Liliang Ren, Robert Horton, Haishen Lü, et al.
For winter wheat (Triticum aestivum L.) that grows during the rainless season, the contribution of groundwater to the root zone ...
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Article
Summary of Advances in Heat-Pulse Methods: Measuring Near-Surface Soil Water ...
Soil Science Society of America Journal (2018)
Xiao Zhang, Tusheng Ren, Joshua Heitman and Robert Horton
Surface layer soil water content is important for evaporation, surface energy balance, seed germination, residue decomposition, microbial activity, and many ...
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Article
Surface Energy Balance Partitioning in Tilled Bare Soils
Agricultural & Environmental Letters (2018)
Ohene Akuoko, Dilia Kool, Thomas J. Sauer and Robert Horton
Core Ideas Following tillage, soil bulk density increased after rainfall. Increases in soil bulk density decreased the available energy for ...
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Article
Determination of Desert Soil Apparent Thermal Diffusivity Using a Conduction ...
Journal of Geophysical Research: Atmospheres (2017)
Zhiqiu Gao, Bing Tong, Robert Horton, Ali Mamtimin, et al.
Surface soil temperatures impact land‐atmosphere interactions in desert environments. Soil apparent thermal diffusivity (k) is a crucial physical parameter affecting ...
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Article
Determining Near-Surface Soil Heat Flux Density Using the Gradient Method ...
Journal of Hydrometeorology (2017)
Xiaoyang Peng, Joshua Heitman, Robert Horton and Tusheng Ren
In the gradient method, soil heat flux density at a known depth G is determined as the product of soil ...
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Article
A Comparison of Second‐Order Derivative Based Models for Time ...
Vadose Zone Journal (2017)
Zhuangji Wang, Robert Schwartz, Yuki Kojima, Yan Chen, et al.
Core Ideas Two methods, AWIGF and second‐order BMO, were evaluated on long‐ and short‐probe TDR waveforms. A corner‐preserving filter was ...
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Article
Macroporous Carbon Supported Zerovalent Iron for Remediation of Trichloroethylene
ACS Sustainable Chemistry and Engineering (2017)
Michael Lawrinenko, Zhuangji Wang, Robert Horton, Deyny Mendivelso-Perez, et al.
Groundwater contamination with chlorinated hydrocarbons has become a widespread problem that threatens water quality and human health. Permeable reactive barriers ...
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Article
Soil Apparent Thermal Diffusivity Estimated by Conduction and by Conduction ...
Journal of Hydrometeorolgy (2017)
Bing Tong, Zhiqiu Gao, Robert Horton and Linlin Wang
Soil heat transfer is complex, and conduction-alone models may not always perform well in estimating soil apparent thermal diffusivity. Soil ...
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Article
An Empirical Model for Estimating Soil Thermal Conductivity from Soil ...
Journal of Hydrometeorology (2016)
Bing Tong, Zhiqiu Gao, Robert Horton, Yubin Li, et al.
Soil thermal conductivity l is a vital parameter for soil temperature and soil heat flux forecasting in hydrological models. In ...
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Article
Impacts of Environmental Colloids on the Transport of 17 β-estradiol ...
Soil and Sediment Contamination: An International Journal (2016)
Jacob R. Prater, Robert Horton and Michael L. Thompson
Estrogens such as 17-β estradiol (E2) are endocrine-disrupting compounds and can affect the reproductive systems of aquatic organisms. Therefore, it ...
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Article
Partitioning evaporation and transpiration in a maize field using heat-pulse ...
Transactions of the ASABE (2016)
X. Xiao, T. J. Sauer, J. W. Singer, R. Horton, et al.
Evapotranspiration (ET) is the sum of soil water evaporation (E) and plant transpiration (T). E and T occur simultaneously in ...
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Article
Sensible Heat Balance Estimates of Transient Soil Ice Contents
Vadose Zone Journal (2016)
Yuki Kojima, Joshua L Heitman, Gerald N Flerchinger, Tusheng Ren, et al.
Soil ice content is an important component for winter soil hydrology. The sensible heat balance (SHB) method using measurements from ...
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Article
Set Loving Relationships as Your Highest Priority
CSA News (2016)
Robert Horton
I am honored to be invited to provide some advice to early career members. Many years have passed since I ...
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Article
Comparison of Models for Determining Soil-Surface Carbon Dioxide Effluxes in ...
Agronomy Journal (2015)
Aaron L. Daigh, Thomas Sauer, Xinhua Xiao and Robert Horton
Models of instantaneous soil-surface CO2 efflux (SCEins) are critical for understanding the potential drivers of soil C loss. Several simple ...
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Article
Bare Soil Carbon Dioxide Fluxes with Time and Depth Determined ...
Soil Science Society of America Journal (2015)
X. Xiao, X. Kuang, T. J. Sauer, J. L. Heitman, et al.
Soil CO2 production rates and fluxes vary with time and depth. The shallow near-surface soil layer is important for myriad ...
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Article
Field Test and Sensitivity Analysis of a Sensible Heat Balance ...
Vadose Zone Journal (2014)
Yuki Kojima, Joshua L. Heitman, Gerald N. Glerchinger, Tusheng Ren, et al.
Feasibility of the sensible heat balance (SHB) method for determining in situ soil ice content with heat pulse (HP) sensors ...
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Article
Measurement of Soil Water Content with Dielectric Dispersion Frequency
Soil Science Society of America Journal (2014)
Jinghui Xu, Sally D. Logsdon, Xiaoyi Ma, Robert Horton, et al.
Frequency domain reflectometry (FDR) is an inexpensive and attractive methodology for repeated measurements of soil water content (θ). Although there ...
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Article
Sensible Heat Balance Measurements of Soil Water Evaporation beneath a ...
Soil Science Society of America Journal (2014)
X. Xiao, J. L. Heitman, T. J. Sauer, T. Ren, et al.
Soil water evaporation is an important component of the water budget in cropped fields; few methods are available for continuous ...
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