Transpiration-use efficiency of barley

Transpiration-use efficiency, the ratio of biomass ( Y) produced per unit of water transpired ( T) by a crop, depends on crop characteristics and on the environment in which crops develop. Transpiration-use efficiency has been described as Y/ T = k c/ D a, where k c is a crop dependent constant and...

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Bibliographic Details
Published in:Agricultural and forest meteorology 2005-05, Vol.130 (1), p.1-11
Main Authors: Kemanian, Armen R., Stöckle, Claudio O., Huggins, David R.
Format: Article
Language:English
Subjects:
Agricultural and forest climatology and meteorology. Irrigation. Drainage
Agricultural and forest meteorology
Agronomy. Soil science and plant productions
Air vapor pressure deficit
Barley
Biological and medical sciences
carbon dioxide
ci/ ca
dry matter accumulation
Economic plant physiology
equations
Fundamental and applied biological sciences. Psychology
gas exchange
General agronomy. Plant production
grain crops
Hordeum vulgare
leaf-to-air vapor pressure deficit
leaves
transpiration
Transpiration-use efficiency
Triticum aestivum
vapor pressure
water
Water balance and requirements. Evapotranspiration
Water relations, transpiration, stomata
water use efficiency
Wheat
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Summary:Transpiration-use efficiency, the ratio of biomass ( Y) produced per unit of water transpired ( T) by a crop, depends on crop characteristics and on the environment in which crops develop. Transpiration-use efficiency has been described as Y/ T = k c/ D a, where k c is a crop dependent constant and D a is the daytime air vapor pressure deficit. Our objectives were to determine Y/ T and k c of barley grown in Pullman, WA, and to analyze the variation in Y/ T and k c of barley ( Hordeum vulgare L.) and wheat ( Triticum aestivum L.) reported in the literature. Transpiration and biomass accumulation of barley crops were measured in the years 2000 and 2001. The coefficient k c was estimated as the slope of the regression between cumulative values of biomass and T/ D a. It ranged from 6.6 ± 0.4 to 6.9 ± 0.2 Pa. These figures are greater than 5.8 Pa obtained by applying equations developed by Tanner and Sinclair [Tanner, C.B., Sinclair, T.R., 1983. Efficient water use in crop production: research or re-search. In: Taylor, H.M., et al. (Eds.), Limitations to Efficient Water Use in Crop Production. ASA, Madison, WI, pp. 1–27]. Data on k c reported in the literature, although scarce, ranged from 3.0 to 5.9 Pa for barley, and from 2.8 to 6.7 Pa for wheat, with the lower values occurring at low D a (
ISSN:0168-1923
1873-2240
DOI:10.1016/j.agrformet.2005.01.003