DOSES DE ÓXIDO DE GRAFENO NOS FATORES BIOFÍSICOS DO FEIJOEIRO-COMUM

Abstract

The use of graphene oxide has attracted interest in agriculture as a plant growth stimulator and fertilizer component. The objective was to investigate doses, timing, and application of graphene oxide on physiological and morphological responses during the initial development of irrigated common beans. The greenhouse trial was conducted at the IF Goiano - Ceres Campus facilities between October and December 2023. The experimental design was randomized blocks, in a factorial arrangement with 2x5 subdivided plots, with four replicates, namely: two phenological stages (V3 and R5) and five doses of graphene oxide (0, 250, 500, 750, and 1000 g ha⁻¹). Physiological and morphological analyses were performed, including gas exchange, chlorophyll content, plant height, stem diameter in the middle third, number of branches, distance between nodes, and dry mass of the aerial part and root. At different doses and application times, graphene oxide did not promote significant morphological effects on the initial development of the bean plant, except for the phase × dose interaction in fresh root mass. However, there were specific physiological responses, such as a 20.27% increase inphotosynthesis and a 15.11% reduction in transpiration. Thus, graphene oxide demonstrated physiological sensitivity but did not generate consistent agronomic benefits.