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Effects of Environment on Response of Soybeans to TIBA¹

Experiments conducted over a period of 7 years on soybeans (Glycine max (L.) Merrill) Ontario, indicated that preflowering environmental conditions affected the response of soybean yields to application of 2, 3, 5-triiodobenzoic acid (TIBA). Trials conducted in years when precipitation was above average and temperatures were normal during the preflowering period resulted in yield increases following TIBA application. However, in years when precipitation was normal or below normal or temperatures were below normal during the preflowering period, no positive yield responses to TIBA application were observed. No relationship was observed between environmental conditions after first flower appearance and yield response to TIBA applications.

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

² Associate Professor, Professor, and Research Associate, respectively, Crop Science Department, University of Guelph, Guelph, Ontario.

Received for publication June 30, 1971.