Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 11:582-584 (1971)
© 1971 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Growth Regulator and Antitranspirant Chemicals on Water Requirement and Growth Components of Alfalfa (Medicago sativa L.)1

D. F. Cole, A. K. Dobrenz and M. A. Massengale2

Plants of Medicago sativa L. cult. ‘Mesa-Sirsa’ were grown in both the greenhouse and controlled environmental growth chambers and used to evaluate the effect ot various antitranspirant and growth regulator chemicals on water requirement and growth components. Gibberellic acid (GA) significantly lowered the water requirement of alfalfa in all environments. Indoleacetic acid (IAA), (2-chloroethyl) trimethylammonium chloride (CCC), phenylmercuric acetate (PMA), and dodecenylsuccinic acid (DSA) did not alter the water requirement of alfalfa. The antitranspirant chemicals did not reduce the amount of water transpired, and further DSA caused plant damage when used as a foliar spray.

Gibberellic acid significantly increased the amount of stem tissue produced in all environments, which resulted in more total dry-forage yield. Gibberellic acid had no effect on the amount of leaflet tissue produced except in experiments where GA stimulated secondary branching.

Key Words: Water-use efficiency • Gibberellic acid • Protein content • Dry-matter production

1 Contribution from Department of Agronomy, University of Arizona, Tucson, Ariz. This research was financed in part by Grant 716-15-2 from the Cooperative State Research Service of the U. S. Department of Agriculture. Part of a dissertation submitted by the senior author in partial fulfillment of the requirements for the Ph.D, degree. Arizona Agricultural Experiment Station Journal Paper No. 1810.

2 Formerly Research Assistant, (now Research Plant Physiologist, Field Crops and Animal Products Research Branch, MQRD, ARS, USDA, Beltsville, Md. 20705) and Professor and Head, Department of Agronomy, University of Arizona, Tucson 85721.

Received for publication January 30, 1971.




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