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Interaction of 2,3,5-Triiodobenzoic Acid, Temperature, and Moisture on Soybean Development¹

Variations in plant response to foliar application of 2,3,5-triiodobenzoic acid (TIBA) on soybean [Glycine max (L.) Merr.] under field conditions appeared to be related to temperature and soil moisture conditions near application time. Greenhouse and growth chamber studies were conducted to provide information on the interacting effects of temperature and soil moisture.

A 2 x 2 x 2 factorial experiment with soybeans in the greenhouse included two levels of premoisture, postmoisture and TIBA. Three temperature regimes simulating cool (21/16 C), warm (27/21 C), and hot (32/24 C) climates were additional variables to the greenhouse experiment for a 3 x 2 x 2 x 2 factorial growth chamber experiment. Effects on plant height and reproductive development were studied.

The TIBA response, as determined from plant height measurements under greenhouse conditions, was reduced by soil moisture stress following TIBA application. Under growth chamber conditions the TIBA effect on plant height generally increased as temperature increased from cool to hot. Floral and/or pod abortion was enhanced under high soil moisture and high temperatures. TIBA applied at floral initiation aided in the retention of greater numbers of pods under high temperature and high soil moisture.

Key Words: Glycine max • TIBA • Climate-moisture • Interaction

² Assistant Professor of Agronomy, University of Georgia, College of Agriculture Experiment Stations, Georgia Station, Experiment, Ga. 30212, and Senior Research Scientist, Research and Development, American Can Co., Neenah, Wis. 54956. Formerly, Specialist, Plant Physiology and Research Plant Physiologist, respectively, Growth Sciences Center, International Minerals and Chemical Corp., Libertyville, 111. 60048.

Received for publication November 3, 1971.