Full TGIF Record # 94963
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    Last checked: 10/13/2015
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Report
Author(s):van Donk, S. J.; Tollner, E. W.; Steiner, J. L.; Evett, S. R.
Author Affiliation:van Donk: ASAE Member Engineer, Post-Doctoral Research Associate, USDA-ARS, Manhattan, Kansas; Tollner: ASAE Member Engineer and Professor, Department of Biological and Agricultural Engineering, University of Georgia, Athens, Georgia; Steiner: Soil Scientist, USDA-ARS, El Reno, Oklahoma; and Evett: ASAE Member, Soil Scientist, USDA-ARS, Bushland, Texas
Title:Soil temperature under a dormant bermudagrass mulch: Simulation and measurement
Section:Soil & water
Other records with the "Soil & water" Section
Source:Transactions of the American Society of Agricultural Engineers. Vol. 47, No. 1, January/February 2004, p. 91-98.
# of Pages:8
Publishing Information:St. Joseph, MI
Keywords:TIC Keywords: Models; Cynodon; Dormancy; Mulches; Soil water; Soil temperature; Transpiration
Abstract/Contents:"The ENergy and WATer BALance (ENWATBAL) model is a mechanistic, numerical model that simulates soil water and temperature profiles, evaporation from soil, and transpiration from crops, but it does not simulate the effects of a mulch layer. Surface vegetative mulches are becoming more common, especially in reduced-tillage systems, limiting the model's applicability. Our objective was to modify ENWATBAL to enable physically based simulation of the effects of a dense mulch. As a preliminary evaluation of the model, soil temperatures simulated with the modified model were compared with those measured at Watkinsville, Georgia, in Cecil sandy loam (clayey, kaolinitic, thermic, Typic Kanhapludult) under a dense, thatchy layer of dormant bermudagrass (Cynodon dactylon, [L.] Pers.) that acted as a mulch during the simulation period. Measured daily soil temperature amplitudes at 0.04 m depth were about 2.5°C during an 8-day period in December 1995. Simulated amplitudes were 12°C with the original ENWATBAL model (configured for a bare soil) and 3.5°C with the mulch-enhanced model. The root mean square error between hourly measured and simulated soil temperatures was 4.1°C using the original ENWATBAL model and 1.1°C using the mulch-enhanced model. Measured soil temperatures lagged behind those simulated, indicating that conduction may be an important process of heat transfer through the mulch. Two solution methods were tested: an iterative solution for mulch and soil surface temperatures implicit in the energy balance equations, and a linearized explicit solution of the energy balances. The latter method was 50 times faster than the iterative method without compromising accuracy; the largest linearization error was only 0.01°C. The capability to simulate mulch effects increases the scope of problems where ENWATBAL is applicable."
Language:English
References:31
Note:Tables
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ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
van Donk, S. J., E. W. Tollner, J. L. Steiner, and S. R. Evett. 2004. Soil temperature under a dormant bermudagrass mulch: Simulation and measurement. Trans. Am. Soc. Agric. Eng. 47(1):p. 91-98.
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http://elibrary.asabe.org/azdez.asp?JID=3&AID=15874&CID=t2004&v=47&i=1&T=2&redirType=
    Last checked: 10/13/2015
    Requires: PDF Reader
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MSU catalog number: S 671 .A452
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