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The present work had the aim of evaluating the rooting of herbaceous cuttings of VR 43-43 grapevine rootstocks with three IBA concentrations (0; 1,000 and 2,000 mg.L-1) and two substrates (vermiculite and carbonized rice husk). A randomized design was used in a 2 x 3 factorial arrangement with five replications and 10 cuttings per plot. The appraised variables were: percentage of leaf retention, percentage of rooted cuttings; number of roots; length of roots (cm); percentage of sprouting, percentage of alive cuttings; mass of dry and fresh matter of the roots for each cutting (g). There was only influence of the substrate in the fresh and dry mass of the roots, with the largest averages observed for the carbonized rice husk. For the IBA doses, it was verified the highest survival percentage and percentage of rooted cuttings in the control group (without IBA application) and with IBA at 1,000 mg.L-1. There were no significant differences for the interaction between substrate and IBA application. Carbonized rice husk is suitable for the rooting of herbaceous cuttings of VR 43-43 rootstocks, not being necessary the IBA application.<p><p>videira VR 43-43 em três concentrações de AIB (0, 1000 e 2000 mg.L-1) e dois substratos (vermiculita e casca de arroz carbonizada). O delineamento foi o inteiramente casualizado, em arranjo fatorial 2 x 3 com cinco repetições e 10 estacas por parcela. As variáveis avaliadas foram: porcentagem de retenção foliar, porcentagem de estacas enraizadas; número de raízes por estaca; comprimento de raízes (cm); porcentagem brotação, porcentagem de estacas vivas; massa de matéria seca e fresca das raízes por estaca (g). Houve influência do substrato apenas na massa fresca e seca das raízes, com as maiores médias observadas para a casca de arroz carbonizada. Para as doses aplicadas de AIB, foi verificada maior porcentagem de sobrevivência e porcentagem de estacas enraizadas no grupo controle (sem aplicação de AIB) e com aplicação de 1.000 mg.L-1. Não houve diferença significativa na interação entre substrato e aplicação de AIB. Conclui-se que a casca de arroz carbonizada é indicada para o enraizamento de estacas herbáceas do porta-enxerto VR 43-43, não sendo necessária a aplicação de AIB

Efeito do AIB no enraizamento de estacas herbáceas do porta-enxerto de videira VR 43-43 em diferentes substratos