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Published in Crop Sci 10:237-240 (1970)
© 1970 Crop Science Society of America
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Water Requirement and Its Association With Growth Components and Protein Content of Alfalfa (Medicago sativa L.)1

D. F. Cole, A. K. Dobrenz, M. A. Massengale and L. Neal Wright2

Two experiments were conducted in a greenhouse environment at Tucson, Ariz., to investigate the water requirement of five cultivars and two experimental lines of alfalfa (Medicago sativa L.) at the seedling and mature stage of plant development. Another experiment was conducted to investigate differences in water requirement among genotypes within the cultivars ‘Mesa-Sirsa’ and ‘Ladak.’

Significant differences were found in water requirement among cultivars in both the seedling and mature stages of plant development. Significant differences were found among plants of different cultivars in dry forage and transpired water in the seedling stage; however, no significant differences for these factors were found among cultivars in the mature stage of plant development.

Greater variation in water requirement was found within cultivars than was found among cultivars.

Dry forage production, leaflet to stem and petiole ratio, leaf area, and percentage protein of stems and petioles were each significantly associated with water requirement when averaged over all cultivars.

Key Words: Leaf area • Leaf-stem ratio • Protein • Transpiration

1 Contribution from the Department of Agronomy, University of Arizona, and Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Tucson, Ariz. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the M.S. degree. This research was financed in part by Grant 716-15-2 from the Cooperative State Research Service of the ARS, USDA. Arizona Agricultural Experiment Station Journal Paper No. 1504.

2 Research Assistant; Associate Agronomist; Professor of Agronomy; and Research Agronomist, Crops Research Division, ARS, USDA and Professor of Agronomy, Department of Agronomy, University of Arizona, Tucson, Ariz. 85721.

Received for publication June 15, 1969.




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