Effects of Rate, Time, and Method of Application of TIBA on Soybean Production
1969
Bauer, M. E. | Sherbeck, T. G. | Ohlrogge, A. J.
The effect of foliar application at the beginning of flowering of the growth regulator 2,3,5-trliodobenzoic acid (TIBA) on the growth and development of soybeans (Glycine max (L.) Merrill) was studied at several locations in Indiana in 1965 and 1966. TIBA resulted in combine yield increases of up to 15%. The yield increases were due to greater numbers of seed. TIBA treated plants were more resistant to lodging than untreated plants. TIBA treatments reduced plant height, partially inhibited apical dominance, and produced a triangular shaped canopy with a more vertical leaf orientation. In TIBA rate experiments (20 to 150 g/ha), morphological changes were greatest with high levels of TIBA, but yields were maximized at rates of 20 to 50 g/ha. Similar results were obtained in spray volume experiments (47, 94, 187 and 374 liters/ha) indicating that TIBA response is also influenced by the volume of water applied. No significant differences in growth or yield were found among TIBA applicatons at 6 AM, 11 AM, 4 PM or 9 PM.
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