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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Journal Article

Analytical soil-temperature model: correction for temporal variation of daily amplitude  [2004]

Elias, E.A.; Cichota, R.; Torriani, H.H.; Jong van Lier, Q. de;

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The exponential-sinusoidal one-dimensional analytical model reasonably describes soil temperature profile. Surface temperature may be represented by the sum of two sinusoids, one related to annual and the other to daily temperature variations, each one having constant amplitude. We introduce here a correction for the temporal variation of daily amplitude, and demonstrate that the heat equation can still be solved analytically. We compared temperature predictions obtained from the novel and from the usual analytical solution, using the root mean squared error (RMSE). For individual days, at a depth z = 0.10 m, the maximum value was RMSE = 0.30 degrees C; for whole months, the maximum value was RMSE = 0.29 degrees C, and the minimum was RMSE = 0.06 degrees C. The only additional information required to apply our novel equation is information on temporal variation of daily amplitude, so we suggest our equation should be preferred when such data are readily available.
From the journal
Soil Science Society of America journal
ISSN : 0361-5995

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2013
Volume:
68
Issue:
3
Start Page:
784
End Page:
788
All titles:
"Analytical soil-temperature model: correction for temporal variation of daily amplitude"@eng
Other:
"Includes references"
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2013
Volume:
68
Issue:
3
Start Page:
784
End Page:
788
All titles:
"Analytical soil-temperature model: correction for temporal variation of daily amplitude"@eng
Other:
"Includes references"