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Titre :
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Bowen-ratio comparisons with Lysimeter evapotranspiration
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Auteurs :
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J. Prueger ;
J. Hatfield ;
J. Aase ;
J. Pikul
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Type de document :
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article/chapitre/communication
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Année de publication :
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1997
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Format :
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p. 730-736
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Langues:
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= Anglais
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Catégories :
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METEOROLOGIE CLIMATOLOGIE
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Mots-clés:
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EVAPOTRANSPIRATION
;
LYSIMETRIE
;
ZONE SEMI ARIDE
;
MESURE
;
-
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Résumé :
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Water use in agriculture by different cropping systems is of interest in determining crop water use efficiency of different tillage practices that will lead to reduced crop production risk. Lysimeters are considered the standard for evapotranspiration (ET) measurements; however, these units are often not replicated and are few in number at any given location. Our objective was to determine if a simple Bowen-ratio system with nonexchanging psychrometers could provide accurate measurements of ET from lentil (Lens culinaris Medikus) in a semiarid climate. The study was conducted in 1993 and 1994 on two adjacent 180-by 180-m fields with weighing lysimeters (1.68 by 1.68 by 1.83 m) located in the center of each field, on a Williams loam (fine-loamy, mixed Typic Argiboroll) soil near Sidney, MT. A Bowen-ratio system comprised of two nonexchanging psychrometers and anemometers at 0.25 and 1.25 m above the plant canopy surface was placed in the lentil field along with a net radiometer and soil heat flux plate.
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Source :
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Agronomy journal, vol.89
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