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| Web URL(s): | https://archive.lib.msu.edu/tic/its/articles/1997jou1280.pdf
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| Publication Type:
| Refereed |
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| Author(s): | Keeley, S. J.;
Koski, A. J. |
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| Author Affiliation: | Keeley: Department of Horticulture, Forestry, and Recreation Resources, Kansas State University, Manhattan, KS 66506 USA; Koski: Department of Horticulture and Landscape Architecture, Colorado State University, Fort Collins, CO 80523 USA. |
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| Title: | Measuring turfgrass evapotranspiration rates by time-domain reflectometry: a field assessment |
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| Section: | Physiology and ecology: Contributed papers
Other records with the "Physiology and ecology: Contributed papers" Section
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| Meeting Info.: | Sydney, Australia: 1997 |
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| Source: | International Turfgrass Society Research Journal. Vol. 8, No. Part 2, 1997, p. 1280-1290. |
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| Publishing Information: | Blacksburg, VA: International Turfgrass Society |
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| # of Pages: | 11 |
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| Keywords: | TIC Keywords: Evapotranspiration; Time domain reflectometry; Measurement; Poa pratensis; Methodology; Lysimetry; Comparisons
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| Abstract/Contents: | "Time-domain reflectometry (TDR) was evaluated for turfgrass evapotranspiration (ET) research by measuring the in situ ET rates of 16 Poa pratensis L. cultivars. This field study was conducted on a sandy clay soil (Aridic Argiustoll) in 1992 and 1993. Potential ET (PET) of a subset of cultivars was also measured by lysimetry in 1993. TDR-measured cultivar ET rates had high coefficients of variation and conflicted with lysimeter-measured ET rates. TDR-ET rates ranged from 1.8 to 5.0 mm dāā; root activity beneath the waveguide depth probably led to some artificially low rates. Lysimeter-ET rates were less variable and generally higher (4.1-4.6 mm dāā). High variability in the TDR data resulted from the small sampling volume of the waveguides , spatial variablility in soil water content, possible air-gap formation around the waveguides, and attenuation of waveform reflections by the clay soil and the long waveguides. Deep root activity complicates accurate measurement of in situ ET with both lysimetry and TDR. It is recommended that future TDR-ET studies in clayey soils should use 30cm or shorter waveguides installed in succession for deep profiles, and that consideration should be given to alternative waveguide designs which give unambiguous waveform reflections. In addition, several samples per experimental unit may be required in heterogeneous soils to obtain results with an acceptably low coefficient of variation." |
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| Language: | English |
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| References: | 30 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Keeley, S. J., and A. J. Koski. 1997. Measuring turfgrass evapotranspiration rates by time-domain reflectometry: a field assessment. Int. Turfgrass Soc. Res. J. 8(Part 2):p. 1280-1290. |
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MSU catalog number: SB 433 .I52 v. 8 |
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