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Response of Nonirrigated and Irrigated Soybeans [Glycine Max (L.) Merrill] to 2, 3, 5-Triiodobenzoic Acid and Nitrogen

David L. Ashworth, University of Nebraska-Lincoln

Copyright 1967, the author. Used by permission.


The specific experiments reported in this paper were conducted over a two-year period to determine the rate of TIBA (triiodobenzoic acid) and the stage of plant growth at which it should be applied to nonirrigated and irrigated soybeans to obtain maximum yields. A study based on work of Eastin (8) and Greer and Anderson (16) was initiated to determine if seed size and number could be enlarged by application of nitrogen fertilizer and TIBA, thereby further increasing soybean grain yields.

Results indicate that TIBA was most effective in altering reproductive development of soybeans if applied at the 6 leaf stage (about 5% bloom). Nonirrigated plants generally gave a more positive response to TIBA than irrigated plants. Climatic conditions did not appear to alter the effectiveness of TIBA.

Advisor: William L. Colville.