Teores de nutrientes em cultivares de café arábica submetidos à deriva de glyphosate Nutrient content in arabica coffee cultivars subjected to glyphosate drift

Avaliaram-se, neste trabalho, os efeitos do glyphosate sobre os teores foliares de nutrientes em três cultivares de café (Coffea arabica). Utilizou-se o esquema fatorial (3 x 5) em delineamento de blocos casualizados, com quatro repetições, sendo os tratamentos compostos por três cultivares de café: Catucaí Amarelo (2 SL), Oeiras (MG-6851) e Topázio (MG-1190); e cinco doses de glyphosate (0; 57,6; 115,2; 230,4; e 460,8 g ha-1). Aos 45 e 120 DAA, coletaram-se folhas (terceiro par) de ramos plagiotrópicos, contidos na parte mediana das plantas. Os sintomas de intoxicação foram caracterizados por clorose e estreitamento do limbo foliar para os três cultivares de café. Houve redução nos teores foliares de N, P, K, Cu e Zn aos 45 DAA e de N, K, Mn e Zn aos 120 DAA nas plantas de café tratadas com glyphosate, independentemente do cultivar utilizado. O cultivar Topázio apresentou as maiores reduções nos teores foliares de Fe e Mn, aos 45 DAA, e de P e Fe, aos 120 DAA.The effects of glyphosate on the foliar levels of nutrients in three coffee cultivars (Coffea arabica) were evaluated in this work. A factorial (3 x 5) was used in a randomized block design with four replications, with treatments consisting of three coffee varieties: Catucaí Amarelo (2 SL), Oeiras (MG-6851) and Topázio (MG-1190) and five glyphosate doses (0, 57.6, 115.2, 230.4 and 460.8 g ha-1). At 45 and 120 DAA, leaves (third pair) from plagiotrophic branches were collected from the medium part of the plants. Glyphosate intoxication symptoms were characterized by chlorosis and leaf narrowing for the three coffee varieties. There was a reduction in foliar levels of N, P, K, Cu and Zn at 45 DAA, and N, K, Mn and Zn at 120 DAA, in coffee plants treated with glyphosate, regardless of the cultivar used. Cultivar Topázio showed the greatest reductions in the foliar levels of Fe and Mn, at 45 DAA and P and Fe, at 120 DAA, when treated with glyphosate.