SILVA, G. N.; http://lattes.cnpq.br/3151813578087847; SILVA, Gutemberg Nunes.
Résumé:
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.
