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| Web URL(s): | http://elibrary.asabe.org/azdez.asp?JID=3&AID=18459&CID=aeaj2005&v=21&i=3&T=1&redirType=
Last checked: 10/10/2013
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http://elibrary.asabe.org/azdez.asp?JID=3&AID=18459&CID=aeaj2005&v=21&i=3&T=2&redirType=
Last checked: 10/10/2013
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| Publication Type:
| Refereed |
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| Author(s): | Payero, J. O.;
Neale, C. M. U.;
Wright, J. L. |
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| Author Affiliation: | Payero: Assistant Professor, Department of Biological Systems Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska; Neale: Professor, Utah State University, Logan, Utah; Wright: Soil Scientist, United States Department of Agriculture - Agricultural Research Service, Kimberly, Idaho |
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| Title: | Estimating soil heat flux for alfalfa and clipped tall fescue grass |
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| Source: | Applied Engineering in Agriculture. Vol. 21, No. 3, May 2005, p. 401-409. |
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| Publishing Information: | St. Joseph, MI: American Society of Agricultural Engineers |
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| # of Pages: | 9 |
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| Keywords: | TIC Keywords: Medicago sativa; Festuca arundinacea; Evapotranspiration; Height; Energy balance; Evapotranspiration rate; Radiation; Canopy; Models
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| Abstract/Contents: | "Soil heat flux (G) is an important component of evapotranspiration (ET) modeling, especially for estimating ET values for hourly or shorter periods. In this study, meteorological and agronomic measurements were made at Kimberly, Idaho, with purpose of establishing empirical relationships to estimate G for alfalfa clipped tall fescue grass. For both plant surfaces, good linear correlation was found for most days between the averages of the 20-min net radiation (Rn) and G values for a given day. However, when the soil surface was wet, after rain or irrigation, the relationship was subject to hysteresis problems. The linear relationship between G and Rn for alfalfa and also changed with plant canopy height (h), and an equation was derived to estimate G from Rn and h (r2 = 0.88). This equation fitted measured G data much better than two other commonly used models (Allen et al., 1996; Clothier et al., 1986). For tall fescue grass, h did not affect the relationship between Rn and G, as the grass was clipped weekly resulting in a narrow range of h (0.09 to 0.19 m). A linear equation to estimate G as a function of Rn (r2 = 0.91) was derived for clipped tall fescue grass, which was found to fit measured data equally well as the model proposed by Allen et al. (1998), but that uses a single equation for both daytime and nighttime instead of two separate equations." |
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| Language: | English |
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| References: | 37 |
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| Note: | Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Payero, J. O., C. M. U. Neale, and J. L. Wright. 2005. Estimating soil heat flux for alfalfa and clipped tall fescue grass. Appl. Eng. Agric. 21(3):p. 401-409. |
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| Web URL(s):
http://elibrary.asabe.org/azdez.asp?JID=3&AID=18459&CID=aeaj2005&v=21&i=3&T=1&redirType=
Last checked: 10/10/2013
Access conditions: Item is within a limited-access website
http://elibrary.asabe.org/azdez.asp?JID=3&AID=18459&CID=aeaj2005&v=21&i=3&T=2&redirType=
Last checked: 10/10/2013
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: S 671 .A66 |
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