Abstract
The objectives of this investigation were to evaluate the effects of gibberellic acid (GA) on yield, photosynthesis, respiration, specific leaf weight (SLW) and carbohydrate root reserves in alfalfa (Medicago sativa L.) grown under irrigated field conditions at Tucson, Ariz. Data showed that GA significantly increased forage yield on treated plants; regrowth on these plants, however, was reduced. Increases in forage production from GA‐treated plants were due to increased stem production. Photosynthesis, respiration, and SLW were significantly decreased by GA application, and roots from plants sprayed with GA had lower percentages of free and acid‐hydrolyzable (A‐HC) carbohydrates. The results indicate GA affected the ‘source‐sink’ relationship in trans‐location and carbohydrate storage in alfalfa.
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