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Effects of tiba (2,3,5-triiodobenzoic Acid) on Seed Production and Vegetative Growth of Alfalfa (Medicago sativa L.)¹

TIBA (2,3,5-triiodobenzoic acid) was applied at low rates to seed alfalfa (Medicago sativa L.) in the field. Rates of 70 and 140 g of TIBA/ha resulted in seed yield increases of 60% over controls. Glasshouse tests showed that TIBA stimulated an increase in the number of stems per plant, and the greater number of stems probably accounted for the increased seed weight. TIBA retarded vegetative regrowth in glasshouse experiments.

Key Words: Plant growth regulator

² Associate Research Soil Scientist, Laboratory of Nuclear Medicine and Radiation Biology, University of California, Los Angeles and CETO, Nevada Test Site, Mercury, Nev. 89023.

Received for publication February 24, 1971.