Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 10:1-2 (1970)
© 1970 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Efficiency of Water Use and Seedling Drougth Tolerance of Boer Lovergrass, Eragrostis curvula Nees1

L. Neal Wright and A.K. Dobrenz2

Efficiency of water use of five selections of boer lovegrass, Eragrostis curvula Nees (equals E. chloromelas Steud.), was determined under greenhouse and growth chamber environments at Tucson, Ariz. These apomictic selections, which represented extremes for seedling drouth tolerance, were evaluated as seedlings and as mature plants. Significant differences in water-use efficiency, measured as the number of units of water transpired per unit of dry matter produced, were found among selections within environments. Water-use efficiency values were lower for seedling than mature plants, yet relative ranking of selections did not change within stages of maturity. Selections with highest water use were most seedling drouth tolerant. A correlation coefficient of r = .80 indicated a significant negative association between seedling water-use efficiency and seedling drouth tolerance. The same association was shown for seedling drouth tolerance and mature-plant water-use efficiency.

Key Words: Transpired water • Seedling-plant evaluation • Mature-plant evaluation

1 Contribution from the Department of Agronomy, University of Arizona, and Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Tucson, Ariz. This research was financed in part by Grant 716-15-2 from the Cooperative State Research Service of the Agricultural Research Service, U. S. Department of Agriculture. Arizona Agricultural Experiment Station Journal Paper 1458.

2 Research Agronomist, Crops Research Division, Agricultural Research Service, U. S. Depamnent of Agriculture, and Professor of Agronomy; and Associate Agronomist, Department of Agronomy, University of Arizona, Tucson 85721.

Received for publication April 17, 1969.




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