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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

Reference Crop Evapotranspiration from Temperature  [1985]

Hargreaves, George H.; Zohrab A. Samani;

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MEASURED lysimeter evapotranspiration of Alta fescue grass (a cool season grass) is taken as an index of reference crop evapotranspiration (ETo). An equation is presented that estimates ETo from measured values of daily or mean values of maximum and minimum temperature. This equation is compared with various other methods for estimating ETo. The equation was developed using eight years of daily lysimeter data from Davis, California and used to estimate values of ETo for other locations. Comparisons with other methods with measured cool season grass evapotranspiration at Aspendale, Australia; Lompoc, California; and Seabrook, New Jersey; with lysimeter data from Damin, Haiti; and with the modified Penman for various locations in Bangladesh indicated that the method usually does not require local calibration and that the estimated values are probably as reliable and useable as those from the other estimating methods used for comparison. Considering the scarcity of complete and reliable climatic data for estimating crop water requirements in developing countries, this proposed method can do much to improve irrigation planning design and scheduling in the developing countries.
From the journal
Applied engineering in agriculture
ISSN : 0883-8542

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2017
Volume:
v. 1
Issue:
2
Start Page:
96
End Page:
99
Publisher:
American Society of Agricultural Engineers
All titles:
"Reference Crop Evapotranspiration from Temperature"@eng
Other:
"Includes references"
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2017
Volume:
v. 1
Issue:
2
Start Page:
96
End Page:
99
Publisher:
American Society of Agricultural Engineers
All titles:
"Reference Crop Evapotranspiration from Temperature"@eng
Other:
"Includes references"