Erlacher, Wellington AbeldtAmaral, José Francisco Teixeira doAmaral, José Augusto Teixeira doChristo, Bruno FardimFerreira, Daniel SoaresTatagiba, Sandro DanRocha, Brunno Cesar PereiraTomaz, Marcelo AntonioRodrigues, Wagner NunesPartelli, Fábio Luiz2023-10-262023-10-262023-01-20ERLACHER, Wellington Abeldt; AMARAL, José Francisco Teixeira do; AMARAL, José Augusto Teixeira do; CHRISTO, Bruno Fardim; FERREIRA, Daniel Soares; TATAGIBA, Sandro Dan; ROCHA, Brunno Cesar Pereira; TOMAZ, Marcelo Antonio; RODRIGUES, Wagner Nunes; PARTELLI, Fábio Luiz. Effect of indole-3-acetic acid on growth, physiology and nutritional status of young arabica coffee plants. Coffee Science, Lavras, MG, v. 17, p. 172050, 20 jan. 2023. Disponível em: https://coffeescience.ufla.br/index.php/Coffeescience/article/view/2050. Acesso em: 25 oct. 2023.1984-3909https://doi.org/10.25186/.v17i.2050http://www.sbicafe.ufv.br/handle/123456789/13917Coffee is one of the main agricultural commodities in the world. Thus, research aimed at reducing the productive risks of the crop has been increasingly encouraged, among which the use of plant hormones stands out. In addition, the objective of this work was to analyze the effect of the application of indole-3-acetic acid on the growth, nutrition and gas exchange of young Coffea arabica L plants. The experiment was carried out in the field in the city of Alegre, Espírito Santo, Brazil. The experimental design used was randomized blocks, testing the effect of the application of five doses of indole-3-acetic acid in young Arabica coffee plants, in four replications. The application of indole-3-acetic acid stimulates the growth rate of the stem diameter at a concentration of 60 mg L-1, as well as gas exchange in coffee plants, however it did not favor the increase in the substomatic concentration of CO2 instantaneous and intrinsic efficiency in water use and instantaneous carboxylation efficiency. Although the application of EIA was not able to provide direct gains in coffee growth during the experimental period, a longer evaluation of the treatments would possibly provide promising results for the coffee crop. The multivariate analysis showed that higher doses of auxin have a high relationship with the macronutrients studied.pdfenOpen accessGas exchangeauxinhormonal balanceAIACoffea arabica L.Cafeicultura::Sistemas agroecológicos e orgânicosArtigo