Abstract

The aim of the study was to evaluate the response of soyabeans on exposure to gibberellic acid (GA3) on the growth and yield of soybeans. Field experiments was conducted during the 2019 rainy season at the Botanical Garden of Federal University of Lafia. Seeds were collected from AGRO TROPICS LTD Lafia, Nasarawa state. The Soy bean variety was submerged into various concentrations of GA3 (90mg/L, 120mg/L, and 150mg/L). The experiment was laid in a randomized completely block design (RCBD) with three replicates each and one control. Growth and yield parameters were measured. Results showed that there GA3 at different concentration both in 1hour and 2 hours of treatment increased the number of leaves (19.85), (24.23) at 90 mg/L and 120mg/L in 1hour and 2hours exposure time respectively. In the same exposure time (1 hour), treatment 90mg/L increased the plant height (19.98cm) while in 2 hours exposure time, treatments 120mgh/L and 150mg/L increased the plant height. The leaf area, number of flowers and number of seeds increased 90mg/L at the same exposure time (1 hour) but this was so in the 2 hours concentration as leaf area and number of flowers increased at different treatments 150mg/L,90mg/L respectively while the number of seeds increased 150mg/L.

Key words: Soybean, Gibberellic acid, Growth, Variety