Influence of substrate on the production of guapuruvu seedlings (Schizolobium parahyba (Vell.) Blake).

Abstract

The guapuruvu is considered one of the most promising Brazilian native species, especially due to its fast growth. Its wood has application in the production of boxes, linings and planks among others. It is also a promising paper source. This work aimed to evaluate the effect of different substrates in the guapuruvu seedlings formation. It was set up an experiment in a completely randomized design with three treatments and four replications of 15 seeds each, where the following variables were analyzed: germination percentage, germination speed index (GVI), weights of green and dry roots and aerial part of seedlings, and length of aerial part and roots. The evaluated substrates were: washed sand, expanded fine vermiculite and organic compound formed by 1:2 proportions of bovine manure and vegetable soil. There was no substrate effect on the seed germination percentage. The vermiculite resulted in the lowest GVI value. The organic compound and sands produced the best results for green and dry weights, and for aerial part and roots length.