Saturação por bases e fósforo no crescimento inicial de jacarandá-da-Bahia Dalbergia nigra (Vell)

Abstract

The present work was developed with the objective of evaluating the influence of saturation levels by bases and phosphorus doses on the growth of Dalbergia nigra (Vell.) Seedlings - popularly known as jacaranda da Bahia. The experimental design was completely randomized 3 x 4, consisting of 3 levels of base saturation (V1 = original soil, V2 = 45% and V3 = 55%) and 4 phosphorus doses (0, 150, 300 and 450 mg / dm3), totaling 48 experimental units. At 64 days after transplanting measurements were taken of height and collection diameter of all plants, which were harvested, separated in root and aerial part and put to dry to obtain the weight of dry matter. The addition of the corrective mixture to the substrate showed no significant response by the species studied. This lack of response may be related to the fact that this species develops in environments with low fertility. However, it was observed that the angico-blanco respond positively to the application of P, the maximum efficiency doses of the variables plant height, stem diameter and root dry matter, that determine the quality of the seedlings, were between 247 to 273 mg / dm 3.