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Este trabalho objetivou avaliar o enraizamento de estacas herbáceas das goiabeiras 'Paluma' e 'Século XXI' em diferentes substratos, coletadas na primavera e no verão. As estacas foram obtidas de ramos jovens não-lignificados de árvores de quatro anos, com um par de folhas no nó superior e 10 cm de comprimento. Para cada época testada, as estacas foram tratadas por imersão rápida, com cinco doses de AIB (0; 500; 1.000; 1.500 e 2.000 mg/L) e dispostas em bandejas plásticas perfuradas com dois substratos (casca de arroz carbonizada e vermiculita) em câmara de nebulização. Após 70 dias da estaquia, foram avaliadas as seguintes variáveis: porcentagem de enraizamento; massas seca e fresca das raízes; número de raízes por estaca; comprimento das raízes; sobrevivência; retenção foliar e porcentagem de estacas com calo. Concluiu-se que houve maior enraizamento das estacas coletadas no verão e que as doses de 1.500 e 2.000 mg/L de AIB são as mais adequadas para promover as melhores características de enraizamento das estacas para as cvs. Paluma e Século XXI, respectivamente. Os dois substratos utilizados são indicados para a estaquia das goiabeiras estudadas. The objective of this research was to evaluate the influence of different substrates and collection season on the herbaceous cutting rooting of 'Paluma' and 'Século XXI' guava plants (Psidium guajava L.). The herbaceous cuttings were obtained on spring and summer seasons, consisted of 10cm of length, two nodes and a pair of leaves in the superior node, and treated with five doses of IBA (0, 500, 1,500 and 2,000 mg/L) for each season studied, and disposed into plastic boxes containing hull rice coal and vermiculita as substrates. After 70 days, the rooting percentage, roots length, number of roots, fresh and dry matter of roots, survival percentage, foliar retention and percentage of cuttings with callus were evaluated. The results showed that the better rooting percentage occurred in cuttings collected in summer; the 1,500 and 2,000 mg/L of IBA were the most appropriate to provide the best rooting characteristics of 'Paluma' and 'Século XXI' herbaceous cuttings, respectively. Both substrates are indicated for the guava cultivars herbaceous cuttings rooting studied

Efeito de diferentes substratos e épocas de coleta no enraizamento de estacas herbáceas de goiabeira, cvs. paluma e século XXI