TROCAS GASOSAS, CRESCIMENTO E PRODUTIVIDADE DE FEIJOEIRO COMUM COM APLICAÇÃO FOLIAR DE MAGNÉSIO

Abstract

Magnesium is one component of chlorophyll and is associated with many metabolic and enzymatic activities. Its application can minimize physiological stress due to excess solar radiation and favor gas exchange and yield. The foliar application of magnesium sulfate tetrahydrate on gas exchange, growth, and yield of common bean cultivar BRS Estilo was evaluated. For gas exchange, a factorial scheme 5 x 4 was used in split split plots with five phenological phases (V4, R5, R6, R8, and R9) in the plots and four magnesium doses (0 g ha-1, 250 g ha-1, 500 g ha-1, and 1000 g ha-1) in the split plots. A factorial scheme 4 x 2 was used for the growth and yield variables in split split plots with four magnesium doses (0 g ha-1, 250 g ha-1, 500 g ha-1, and 1000 g ha-1) in the plots and two phenological phases (V4 and R6) in the split plots. Stomatal conductance, photosynthesis, transpiration, and vapor and pressure deficit were influenced by the interaction of magnesium doses with the phenological phases. Mg doses only influenced plant height. Magnesium foliar application in common bean plant, cultivar BRS Estilo, did not increase the yield. Keywords: Phaseolus vulgaris L., Cultivar BRS Estilo, Photosynthesis.