Inoculação e adubação orgânica no crescimento inicial de Bauhinia variegata L

Abstract

The use of tree legumes has become a widely used alternative in the reclamation projects of degraded areas, reforestation and urban afforestation, since the production of seedlings for these purposes usually has a high cost, having as an alternative the use of organic compost and Inoculation to promote quality seedlings in which, does not demand high production costs. The objective of this study was to evaluate the initial growth of Bauhinia variegata L. as a function of inoculation and fertilization with different proportions of organic compound. The experiment was conducted in the greenhouse of the Federal University of Recôncavo da Bahia (UFRB) of the Center for Agrarian, Environmental and Biological Sciences (CCAAB), and was arranged in a completely randomized experimental design in a factorial arrangement (2 x 5) + 1, with 9 replicates, consisting of the presence and absence of inoculant, five proportions of organic compound: soil (0: 100, 20:40, 40:60, 60:40 and 80:20) (v: v), and an additional treatment with Chemical fertilization without inoculant. After 90 days of sowing, the following evaluations were performed: height, neck diameter, leaf number and root length. Subsequently, the plants were segmented into aerial part and root, dried and the dry mass of the parts and their relationships were measured. From the dry aerial part of the seedlings, the grinding was carried out to determine the nitrogen, carbon and C/N ratio. The inoculation of diazotrophic bacteria stimulated growth in height, the relation between stem height and diameter, dry mass of shoot, root and total, and the carbon content of the seedlings. It was observed that the seedlings of Bauhinia variegata L. grown with organic compound presented better development than those grown in soil with and without chemical fertilization. Seedlings grown with a 16:84 ratio (organic compound: soil + inoculation) presented a higher Dickson Quality Index, and therefore, this proportion is recommended for the production of Bauhinia variegata L.