In-Situ Characterization of Soil−Water Content Using Gas-Phase Partitioning Tracer Tests:  Field-Scale Evaluation

2003 ◽  
Vol 37 (14) ◽  
pp. 3141-3144 ◽  
Author(s):  
Jason M. Keller ◽  
Mark L. Brusseau
Keyword(s):  
Water Content ◽  
Gas Phase ◽  
Soil Water Content ◽  
Tracer Tests ◽  
Field Scale ◽  
In Situ Characterization ◽  
Scale Evaluation ◽  
Phase Partitioning

A gas-phase partitioning tracer method for the in situ measurement of soil-water content

1999 ◽  
Vol 35 (12) ◽  
pp. 3699-3707 ◽  
Author(s):  
N. T. Nelson ◽  
M. L. Brusseau ◽  
T. D. Carlson ◽  
M. S. Costanza ◽  
M. H. Young ◽  
...  
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Gas Phase ◽  
Soil Water Content ◽  
In Situ Measurement ◽  
Tracer Method ◽  
Phase Partitioning ◽  
Partitioning Tracer

Intermediate-Scale Tests of the Gas-Phase Partitioning Tracer Method for Measuring Soil-Water Content

2003 ◽  
Vol 67 (2) ◽  
pp. 483-486 ◽  
Author(s):  
T. D. Carlson ◽  
M. S. Costanza-Robinson ◽  
J. Keller ◽  
P. J. Wierenga ◽  
M. L. Brusseau
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Gas Phase ◽  
Soil Water Content ◽  
Tracer Method ◽  
Intermediate Scale ◽  
Phase Partitioning ◽  
Partitioning Tracer

Characterizing spatial variability in soil water content for precision irrigation management

2017 ◽  
Vol 8 (2) ◽  
pp. 418-422 ◽  
Author(s):  
A. de Lara ◽  
R. Khosla ◽  
L. Longchamps
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Irrigation Management ◽  
Soil Electrical Conductivity ◽  
Field Scale ◽  
Management Zones ◽  
Mean Differences ◽  
Precision Irrigation

One among many challenges in implementing precision irrigation is the reliable characterization of the soil water content (SWC) across spatially variable fields. For this purpose, commercial retailers are employing apparent soil electrical conductivity (ECa) to create irrigation prescription maps. The accuracy of this method at the field scale has received little attention from the scientific community. Hence, the objective of this study was to characterize spatial distribution of soil water content at the field scale for the purpose of precision irrigation management. Results showed mean SWC to be different across ECa derived management zones, indicating that soil ECa was able to characterize mean differences in SWC across management zones.

scholarly journals Geometrical Considerations and Interfacial Processes Affecting Electromagnetic Measurement of Soil Water Content by TDR and Remote Sensing Methods

2002 ◽  
Author(s):  
Shmuel Friedman ◽  
Jon Wraith ◽  
Dani Or
Keyword(s):  
Remote Sensing ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Effective Permittivity ◽  
Time Domain Reflectometry ◽  
Content Determination

Time Domain Reflectometry (TDR) and other in-situ and remote sensing dielectric methods for determining the soil water content had become standard in both research and practice in the last two decades. Limitations of existing dielectric methods in some soils, and introduction of new agricultural measurement devices or approaches based on soil dielectric properties mandate improved understanding of the relationship between the measured effective permittivity (dielectric constant) and the soil water content. Mounting evidence indicates that consideration must be given not only to the volume fractions of soil constituents, as most mixing models assume, but also to soil attributes and ambient temperature in order to reduce errors in interpreting measured effective permittivities. The major objective of the present research project was to investigate the effects of the soil geometrical attributes and interfacial processes (bound water) on the effective permittivity of the soil, and to develop a theoretical frame for improved, soil-specific effective permittivity- water content calibration curves, which are based on easily attainable soil properties. After initializing the experimental investigation of the effective permittivity - water content relationship, we realized that the first step for water content determination by the Time Domain Reflectometry (TDR) method, namely, the TDR measurement of the soil effective permittivity still requires standardization and improvement, and we also made more efforts than originally planned towards this objective. The findings of the BARD project, related to these two consequential steps involved in TDR measurement of the soil water content, are expected to improve the accuracy of soil water content determination by existing in-situ and remote sensing dielectric methods and to help evaluate new water content sensors based on soil electrical properties. A more precise water content determination is expected to result in reduced irrigation levels, a matter which is beneficial first to American and Israeli farmers, and also to hydrologists and environmentalists dealing with production and assessment of contamination hazards of this progressively more precious natural resource. The improved understanding of the way the soil geometrical attributes affect its effective permittivity is expected to contribute to our understanding and predicting capability of other, related soil transport properties such as electrical and thermal conductivity, and diffusion coefficients of solutes and gas molecules. In addition, to the originally planned research activities we also investigated other related problems and made many contributions of short and longer terms benefits. These efforts include: Developing a method and a special TDR probe for using TDR systems to determine also the soil's matric potential; Developing a methodology for utilizing the thermodielectric effect, namely, the variation of the soil's effective permittivity with temperature, to evaluate its specific surface area; Developing a simple method for characterizing particle shape by measuring the repose angle of a granular material avalanching in water; Measurements and characterization of the pore scale, saturation degree - dependent anisotropy factor for electrical and hydraulic conductivities; Studying the dielectric properties of cereal grains towards improved determination of their water content. A reliable evaluation of the soil textural attributes (e.g. the specific surface area mentioned above) and its water content is essential for intensive irrigation and fertilization processes and within extensive precision agriculture management. The findings of the present research project are expected to improve the determination of cereal grain water content by on-line dielectric methods. A precise evaluation of grain water content is essential for pricing and evaluation of drying-before-storage requirements, issues involving energy savings and commercial aspects of major economic importance to the American agriculture. The results and methodologies developed within the above mentioned side studies are expected to be beneficial to also other industrial and environmental practices requiring the water content determination and characterization of granular materials.  

Intermediate-Scale Tests of the Gas-Phase Partitioning Tracer Method for Measuring Soil-Water Content

2003 ◽  
Vol 67 (2) ◽  
pp. 483 ◽  
Author(s):  
T. D. Carlson ◽  
M. S. Costanza-Robinson ◽  
J. Keller ◽  
P. J. Wierenga ◽  
M. L. Brusseau
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Gas Phase ◽  
Soil Water Content ◽  
Tracer Method ◽  
Intermediate Scale ◽  
Phase Partitioning ◽  
Partitioning Tracer

In Situ Characterization of Gas-Phase Species Present During Hafnium Oxide Atomic Layer Deposition

2019 ◽  
Vol 2 (7) ◽  
pp. 133-143 ◽  
Author(s):  
James E. Maslar ◽  
Wilbur Hurst ◽  
Donald Burgess ◽  
William Kimes ◽  
Nhan Nguyen
Keyword(s):  
Atomic Layer Deposition ◽  
Gas Phase ◽  
Hafnium Oxide ◽  
Atomic Layer ◽  
In Situ Characterization ◽  
Layer Deposition
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