Qualidade de mudas de barriguda (Ceiba glaziovii (Kuntze) K. Schum.) sob diferentes substratos e luminosidades.

Abstract

Native forest species seedlings production has the purpose of attending to the plantations finality, and for this one must study factors that influence the quality of these seedlings. To intensify knowledge about native species, this study aims to evaluate substrates and levels of luminosity´s effect on Ceiba glaziovii (Kuntze) K. Schum seedlings quality. The treatments tested consisted of the combination of four substrates: (S1) = Clay + Sand + Plantmax (1:1:1, v:v:v); (S2) = Clay + Sand + Catlle Manure (1:1:1, v:v:v); (S3) = Cattle Manure + Sand + Plantmax (1:1:1, v:v:v) and (S4) = Clay + Sand + Plantmax + Catlle Manure (1:1:1:1,v:v:v:v) in four light intensities, using different screens: (L1) = 80% of shading; (L2) = 50% of shading; (L3) = 25% of shading; and (L4) = Full sun. The sowing was done in conical tubes 280 cm3 and after 15, 30, 45 and 60 days, were evaluated the seed emergence, height, caller diameter, root length, height / diameter relation, root and shoot dry mass and Dickson´s Quality Index. The experiment was carried out in a completely randomized design, with four replicates of 24 plants. The results showed that seedlings development underwent substrate and luminosities influence. The use of the substrates S2, S3 or S4 and full sunshine or 25% of shading proved to be favorable for producing high quality seedlings of Barriguda, in the experimental conditions employed.