Effect of indole-3-acetic acid on growth, physiology and nutritional status of young arabica coffee plants

Coffee is one of the main agricultural commodities in world. Thus, research aimed at reducing productive risks crop has been increasingly encouraged, among which use plant hormones stands out. In addition, objective this work was to analyze effect application indole-3-acetic acid on growth, nutrition and gas exchange young Coffea arabica L plants. The experiment carried out field city Alegre, Espírito Santo, Brazil. experimental design used randomized blocks, testing five doses Arabica coffee plants, four replications. stimulates growth rate stem diameter a concentration 60 mg L-1, as well however it did not favor increase substomatic CO2 instantaneousand intrinsic efficiency water instantaneous carboxylation efficiency. Although EIA able provide direct gains during period, longer evaluation treatments would possibly promising results for crop. multivariate analysis showed that higher auxin have high relationship with macronutrients studied.Key words: Gas exchange; auxin; hormonal balance; AIA; L.