Soybean production is negatively affected by certain morphology related factors such as the occurrence of short lowest pod height which results in stubble losses since the pods lower than the reach of the combine cutter are lost during harvest. Therefore, it is necessary to develop strategies that can promote the elongation of lower internodes such that the first pods can be set at a harvestable height. Plant hormones such as gibberellins (GA) and cytokinins play important roles in regulating stem elongation through promoting cell elongation and cell division, respectively. Therefore, plant growth regulators (PGRs) containing GAs and cytokinins can promote internode elongation and therefore the height of lowest pod bearing nodes. Using a soybean cultivar characterized by a short lowest pod height, this thesis investigated the effects of GA and/or cytokinin based PGRs, applied as a seed treatment, on enhancing the elongation of lower internodes and thereby lowest pod height. The findings show that the GA based PGR was effective in increasing the lengths of lower internodes and height of the lowest pods. In order to gain insights into the molecular basis of GA metabolism in the regulation of pod heights, this thesis examined the expression patterns of GA biosynthetic and catabolism genes in lower internodes of three different soybean cultivars with contrasting pod heights. The results indicate that the three cultivars exhibit differential expression patterns of the genes analyzed.