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| Web URL(s): | https://acsess.onlinelibrary.wiley.com/doi/10.2136/sssaj2001.6514
Last checked: 02/28/2024
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https://acsess.onlinelibrary.wiley.com/doi/epdf/10.2136/sssaj2001.6514
Last checked: 02/28/2024
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| Publication Type:
| Refereed |
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| Author(s): | Vaz, Carlos Manoel Pedro;
Hopmans, Jan W. |
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| Author Affiliation: | Vaz: EMBRAPA, Agricultural Instrumentation, San Carlos-SP, Brazil; Hopmans: Department of Land, Air and Water Resources, Hydrology Program, University of California, Davis, CA |
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| Title: | Simultaneous measurement of soil penetration resistance and water content with a combined penetrometer-TDR moisture probe |
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| Section: | Division S-1 - Soil physics
Other records with the "Division S-1 - Soil physics" Section
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| Source: | Soil Science Society of America Journal. Vol. 65, No. 1, January/February 2001, p. 4-12. |
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| Publishing Information: | Madison, WI: Soil Science Society of America |
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| # of Pages: | 9 |
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| Keywords: | TIC Keywords: Physical properties of soil; Soil profiles; Permeability; Measurement; Soil water content; Penetrometers; Soil strength; Soil moisture; Time domain reflectometry; Techniques; Compaction; Product profile; Bulk density; Mathematical equations
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| Abstract/Contents: | "Soil mechanical impedance affects root growth and water flow, and controls nutrient and contaminant transport below the rooting zone. Among the soil parameters affecting soil strength, soil water content and bulk density are the most significant. However, field water content changes both spatially and temporally, limiting the application of cone penetrometers as an indicator of soil strength. Considering the presence of water content variations within a soil profile across a field and the large influence of water content on soil strength, there is need for a combined penetrometer-moisture probe to provide simultaneous field water content and soil resistance measurements. Such a probe was developed, which uses the time domain reflectometry (TDR) technique to determine water content and its influence on soil penetration resistance. The coiled TDR moisture probe consists of two parallel copper wires, each 0.8 mm in diameter and 30 cm long, coiled around a 5-cm-long polyvinyl chloride (PVC) core with a 3-mm separation between wires. Calibration curves relating the soil bulk dielectric constant measured by the coiled probe to water content were obtained in the laboratory for a Columbia fine sand loam (coarse-loamy, mixed, superactive, nonacid, thermic Oxyaquic Xerfluvent), a Yolo silt clay loam (fine-silty, mixed, non-acid, thermic Typic Xerothent), a washed sand, and data were analyzed based on a mixing model approach. Subsequently, field experiments were conducted to measure simultaneously the penetration resistance (PR) and water content along a soil profile. Results showed a detailed water content profile with excellent correlation with the gravimetric method, whereas the depth distribution of PR was similar to that of dry bulk density as determined from soil cores." |
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| Language: | English |
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| References: | 43 |
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| Note: | Tables
Graphs
Figures |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Vaz, C. M. P., and J. W. Hopmans. 2001. Simultaneous measurement of soil penetration resistance and water content with a combined penetrometer-TDR moisture probe. Soil Sci. Soc. Am. J. 65(1):p. 4-12. |
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| Web URL(s):
https://acsess.onlinelibrary.wiley.com/doi/10.2136/sssaj2001.6514
Last checked: 02/28/2024
Access conditions: Item is within a limited-access website
https://acsess.onlinelibrary.wiley.com/doi/epdf/10.2136/sssaj2001.6514
Last checked: 02/28/2024
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: S 590 .S65 |
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