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Response of Bragg Soybean to TIBA (2,3,5-Triiodobenzoic Acid)¹

Studies involving the use of TIBA (2,3,5-triiodobenzoic acid) on indeterminate soybeans [Glycine max (L.) Merrill] have shown that increased grain yields are more likely to occur when the growth regulator is applied as a single application during flower initiation. TIBA studies using determinate varieties are more limited. Results from these studies are more erratic and yield increases are more likely to be associated with a much earlier time of application.

In order to determine the most appropriate method of applying TIBA to determinate soybeans, a single rate (38g/ha) of TIBA was applied to the soybean variety ‘Bragg’ either in a single or in multiple applications during early vegetative growth stages for two years in field experiments.

TIBA applications during the two, four, or six trifoliolate growth stage increased soybean yields over the 2-year period. These yield increases ranged from 7.0 to 9.8%.

In general, a single application was just as effective as multiple applications in increasing yields.

Plant height was reduced by as much as 13.3% when TIBA was applied at either the four or six trifoliolate growth stage. This reduction in plant height did not help reduce lodging as has been reported for TIBA applications made later in the growing season on indeterminate varieties. In this study TIBA either had no effect on lodging or increased lodging.

Key Words: Glycine max (L.) Merrill • Growth regulator

² Assistant Professor of Crop Science, North Carolina State University, Raleigh, N. C. 27607.

Received for publication April 17, 1972.