Crescimento e qualidade de mudas de sabiá (Mimosa caesalpiniifolia Benth.) em diferentes substratos.

Abstract

Mimosa caesalpiniifolia (Benth.) (Mimosaceae) is a fast-growing tree, typical of semiarid region of northeast´s Brazil. It is pioneer xerophytic, which grows in all soil types, except in the flooded. The absence of knowledge about the production of seedlings of this species was the main goal to conduct this experiment which evaluate the growth and quality of seedlings produced in different substrates. The plants were grown in rigid plastic tubes containing 280 cm3 of substrate, consisted of a mixture of soil with the material to be tested in 3:1 the proportion. The treatments were distributed in a completely randomized design with five replications, consisted of a mixture of soil+manure, soil+kaolin reject, soil+humus and soil+vermiculite reject. At 120 days after thinning were evaluated height, diameter stem, height/diameter ration, absolute growth rate, number of leaves, stem dry mass, leaf dry mass, roots dry mass, shoot dry mass, shoot/root dry mass ration, total dry mass and Dickson Quality Index. The substrates soil+vermiculite reject and soil+manure produced better quality seedlings. The substrate soil+humus did not show satisfactory results.