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Interaction of 2,3,5‐Triiodobenzoic Acid and 2,4‐Dichlorophenoxyacetic Acid on Growth and Yield of Soybeans 1
Author(s) -
Johnson R. R.,
Anderson I. C.
Publication year - 1974
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1974.0011183x001400030012x
Subject(s) - yield (engineering) , glycine , 2,4 dichlorophenoxyacetic acid , biology , maturity (psychological) , horticulture , agronomy , botany , biochemistry , amino acid , materials science , psychology , developmental psychology , metallurgy
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.