O objetivo do trabalho foi avaliar o uso de miniestufas de garrafas PET, para enraizamento de miniestacas de Enterolobium contortisiliquum. Foram instalados dois experimentos no viveiro. No primeiro experimento, foram preparadas 60 miniestacas, sendo 30 mergulhadas em solução de AIB na concentração de 2000 mg/L e 30 mergulhadas em água por 60 segundos e estaqueadas nas garrafas com substrato comercial. Após 30 dias foram quantificadas miniestacas vivas com formação de calos, miniestacas vivas com raiz e miniestacas mortas. No segundo experimento, foram utilizadas miniestacas caulinares e foliares de5 cm sem o uso do hormônio, pois não foi verificada diferença de enraizamento no primeiro experimento. Foram confeccionadas 30 miniestacas caulinares e 30 foliares e estaqueadas em garrafa PET, mantidas por 30 dias sendo avaliadas, quanto à sobrevivência, ao número de raízes emitidas e comprimento das raízes. Após as avaliações foram transplantadas para tubetes de 280 cm³ para avaliar o desenvolvimento das mudas, sendo mantidas por 60 dias no viveiro, avaliando se altura da parte aérea e diâmetro do colo. Os experimentos foram instalados em delineamento inteiramente casualizado, dois tratamentos e um ambiente de enraizamento. Para o primeiro experimento os tratamentos foram com e sem hormônios e os dados foram analisados pelo teste chi square e o segundo experimento foram dois tipos de miniestacas (caulinares e foliares) e os dados analisados pelo teste t (student) a 5% de probabilidade. O uso de miniestufas confeccionadas com garrafas PET é promissor para propagação vegetativa do Tamboril.
This study aimed to evaluate the use of minigreenhouses of PET bottles for rooting cuttings of Enterolobium contortisiliquum. Two experiments were installed in a nursery. For the first experiment, 72 minicuttings were prepared, 36 dipped in AIB solution at a concentration of 2.000 mg L-1 and 36 soaked in water for 60 seconds and planted in bottles containing commercial substrate. After 30 days, the live minicuttings with callus formation, live minicuttings with roots and dead minicuttings
were quantified. In the second experiment, it was used stem cuttings and leaf minicuttings of 5 cm without the use of the hormone, due to the fact that rooting difference was not verified in the first experiment. 30 stem minicuttings and 30 leaf minicuttings were obtained and planted in PET bottles. They were studied for 30 days, at which the survival rates, number of issued roots and their lengths were assessed. After the assessments, the seedlings were transplanted into 180 cm3 plastic tubes to evaluate their development, being held for 60 days in the nursery; the aerial part height and stem diameter were evaluated. The experiments were conducted in a rooting environment, in a completely randomized design, under two treatments. For the first experiment, the treatments were conducted with and without hormones and the data were analyzed by the chi square test; for the second experiment, two types of minicuttings (stem and leaf) were conducted and analyzed by t-test (student) at 5% of probability. It was found that the use of mini greenhouse made with PET bottles allowed the rooting of minicuttings of Enterolobium contortisiliquum without the need of using hormones, and the stem minicuttings formed seedlings of superior quality.
