| Four substrates were compared (peat, no. 2 gravel only, mixture of no. 2 gravel and peat at a 3:1 ratio, and xaxim) for use in ex vitro growth of Cattleya forbesii and Laelia purpurata - Orquidacea. A substrate x species interaction was observed for the variables vigor and height, showing that each species has its own specificity for substrate. For C. forbesii, xaxim placed first in two of the four assessed parameters. Next came the gravel:peat substrates and peat in the second position for two parameters and in third place for two. In last place was gravel, which was in fourth place for all four parameters assessed. For L. purpurata, the substrates with the greatest number of parameters in first and second positions were gravel:peat and peat, both with... |
