GIBBERELLIC ACID AND PACLOBUTRAZOL APPLICATION IN CULTURE OF SOYBEAN CROP

Gibberellins are associated with stem growth promotion and its application in plants can induce a significant increase in their height. Paclobutrazol is considered growth regulator, used in agriculture to control vegetative growth, stimulating the plants' reproductive capacity. The objective of this study was to evaluate the growth, morphological changes and leaf chlorophyll content A, B and total in soybean plants by applying gibberellic acid in the leafs and paclobutrazol in the soil. The experiment was conducted at the State University of Mato Grosso do Sul, Cassilandia University Unit in a completely randomized design with factorial arrangement of 2 x 2, with application of paclobutrazol in the soil (present and absent) and gibberellin in the leaf (present and absent), with eight replications. Paclobutrazol reduced leaf area, stem dry weight and diameter of the soybean. The gibberellic acid induced an increase in the leaflets' width, chlorophyll A content and the reduction in the chlorophyll B. The joint application of paclobutrazol and gibberellic acid in soybean propitiated length reduction leaflets, width of leaflets and chlorophyll A content.