Utilização de garrafas de politereftalato de etileno (pet) na propagação de Enterolobium contortisiliquum por miniestaquia

Abstract

Considering the negative impacts generated by the PET bottles disposal on the environment, this work aimed to evaluate its use as rooting environment for minicuttings of Entrelobium contortisiliquum, a species of fast growth, widely distributed and recommended for serveral purposes. The cuttings, obtained from multiclonal minigarden in the forest nursery of the UFRB in Cruz das Almas-Ba, were used for both experiments. In the first experiment the need to use hormone (AIB) to the rooting of cuttings was assayed, evaluating minicuttings with callus formation, alive minicuttings rooted and dead minicuttings, thirty days after stakeout. The data were analyzed by chi-square test. In the second experiment, we used minicuttings stem and leaf without using hormone. These were kept for 30 days in PET bottles greenhouses and evaluated for survival, number of roots and length of roots by cuttings, and then transplanted to tubes of 280 cm3, evaluating seedling growth in stem diameter and shoot after 60 days. The data were analyzed by t test (student) at 5% probability. It was concluded in the first experiment that using IBA hormone in the concentration 2000 mL/L did not influence the amount of rooted cuttings. In the second experiment it was found that leaf cuttings produce inferior seedlings in comparison with stem cuttings. It was observed that PET bottles as cuttings rooting environment enabled an environment conducive to rooting with reduced cost compared to the traditional method.