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Interaction of 2,3,5-Triiodobenzoic Acid and 2,4-Dichlorophenoxyacetic Acid on Growth and Yield of Soybeans¹

The growth regulators 2,4-dichlorophenoxyacetic acid (2,4-D) and 2,3,5-triiodobenzoic acid (TIBA) were foliarly applied to field-grown soybeans (Glycine max (L.) Merr.) at various growth stages. Simultaneous application of the chemicals resulted in TIBA enhancement of the action of 2,4-D. Application of a combined spray caused delayed maturity, greater lodging, distorted leaves, and yield reduction when TIBA was combined with 22.5 g/ha of 2,4-D. When the 2,4-D was applied 1 or 2 weeks before applying TIBA, it had little effect on maturity, lodging, and leaf morphology, but it tended to increase seed yield. The feasibility of using 2,4-D with TIBA to increase yield is limited since the optimum rate of 2,4-D varies with environment and variety.

Key Words: Morphology • Plant growth regulator

² Research Assistant and Professor of Agronomy and Botany, Iowa State University, Ames, IA 50010.

Received for publication September 28, 1973.