Crescimento de mudas de umbuzeiro sob doses crescentes de giberelina

Abstract

The objective of this work was to evaluate the growth of umbuzeiro seedlings submitted to increasing doses of gibberellic acid (GA3). The experiment was conducted in the experimental field of the State University of Goiás, Campus Ipameri, Goiás. The seedlings of Spondias tuberosa at 70 days after emergence were transplants for polyethylene pots with volume of eight liters containing substrate composed of Red-Yellow Latosol, sand and manure in the ratio of 3: 1: 0.5, respectively. Five treatments, concentrations of gibberellic acid (GA3) of 0 mg L-1; 100 mg L-1; 200 mg L-1; 300 mg L-1 and 400 mg L-1, were arranged in a completely randomized design with six replicates and a plot of a useful plant. 30 ml of GA3 were used in single application via foliar spraying with the aid of hand sprayer in 250-day old umbuzeiro plants. At 30 days after the imposition of the treatments the plants were analyzed. The application of gibberellin provided a morphophysiological adjustment for plant height, stem diameter, stomatal density, leaf area and length of xylopodium, except for the diameter of xylopodium. The GA3 doses increased mainly the aerial part (plant height, stem diameter and leaf area) and in the underground part (length of xylopodium and root area), resulting in a greater accumulation of biomass.The use of gibberellic acid (GA3) in increasing doses positively influences the growth of umbuzeiro seedlings, expressed by height, leaf area and total biomass