Dormancy and Nondormancy Alfalfa Yield and Evapotranspiration
Publication: Journal of Irrigation and Drainage Engineering
Volume 120, Issue 6
Abstract
Although living alfalfa plants show no elongation during dormancy, evapotranspiration can occur. The yield of the first harvest and dormancy could be statistically correlated as it is correlated during the growing season. The objective of this study was to evaluate the statistical correlations of yield and and of water use efficiency (WUE) and during dormancy and nondormancy. The correlations involving data from several years, with four harvests per growing season, were evaluated based on slopes and intercepts. Six data points for which dormancy was known were added to evaluate the statistical fit. Correlations between yield and for various harvests had one common slope but different intercepts; the same was true for the correlation between WUE and , except the latter correlation was weak in terms of . Average values of and the corresponding estimated yield showed that between one‐third and half of the observed average water loss during dormancy fit the estimated yield and correlation. The remaining amount appeared to be an extra water loss during dormancy.
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References
1.
Goodrich, M. T. (1986). “Dormant season evapotranspiration in alfalfa,” MSc thesis, Univ. of Nevada, Reno, Nev.
2.
Goodrich, M. T., and Guitjens, J. C. (1987). “Dormant season evapotranspiration in alfalfa.” Proc., ASCE Irrig. and Drainage Div. Specialty Conf., 175–181.
3.
Guitjens, J. C. (1982). “Models of alfalfa yields and evapotranspiration.” J. Irrig. Drain. Div., ASCE, 108(3), 212–222.
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Copyright © 1994 American Society of Civil Engineers.
History
Received: Apr 15, 1993
Published online: Nov 1, 1994
Published in print: Nov 1994
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