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Growth Analysis of Soybeans Treated with TIBA¹

A growth analysis study was employed in an attempt to understand the mechanism by which the growth regulator 2,3,5-triiodobenzolc acid (TIBA) increases soybean [Glycine max (L.) Merrill] yields. Four soybean cultivars were sprayed at flowering time with an aqueous solution containing TIBA. Under good growth conditions, seed yields were increased by the treatment; no yield response was shown when conditions were poor for growth. Latermaturing cultivars responded more than early-maturlng cultivars. Total dry matter production and rate of total dry matter production were not altered by TIBA; however, both seed yield and rate of reproductive dry matter production were greater on treated than on control plots. The data support the theory that TIBA acts by slowing vegetative growth and increasing reproductive growth rather than the theory proposing that the increase occurs as a result of improved canopy efficiency. Breeding implications are discussed.

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

² Professor and former Graduate Student, respectively, Crop Science Department, University of Guelph, Guelph, Ontario, Canada.

Received for publication August 6, 1973.