In this study three tree species, namely Dolichandrone atrovirens (Heyne ex Roth) Sprague (Bignoniaceae), Eugenia jambolana Lam. DC (Myrtaceae) and Terminalia bellerica (Gaertn.) Roxb. (Combretaceae) were treated with three concentrations of GA3 (50, 100 and 200 ppm) by foliar application in 6 month-old saplings. Foliar application of GA3 resulted in an increase in shoot length, internodal elongation, leaf area, biomass production, chlorophyll content, RuBPcarboxylase activity, protein content and the rate of photosynthesis in all the three tree species and at all the concentrations studied. The highest concentration of GA3 was found to be superior than the other two lower concentrations. Foliar application of GA3 is therefore found beneficial in hastening plant growth, biomass production and associated physiological parameters of all three species studied.
