Impacts of Gibberellic Acid (GA3) on growth and yield of green beans (Phaseolus vulgaris L.) in Northern Tanzania

Green bean production in Tanzania ranges from 6 to 8 t/h which is far below the potential yield of 15 to 20 t/ha, which is largely caused by poor soil fertility of most of Tanzania’s land. Gibberellic acids (GAs) are naturally occurring growth-stimulating substances used to promote the growth and development of many plant species. Therefore, the study was carried out to determine the effects of Gibberellic acid growth hormone on the growth and yield of green beans at field conditions. The experiment was conducted using Randomized Complete Block Design with four replications and five treatments at TARI - Tengeru research farm from May to August 2023. Treatments were negative control, with three rates of Gibberellic acid (6.25 g/ha, 12.5 g/ha, and 18.75 g/ha) and Snow Paushak (500 ml/ha) as positive control. Data on growth and yield variables were collected at 33, 40, 47, 54, and 62 days after planting (DAP). The results showed that the application of GA3 significantly (p