The tree fern fiber and sphagno are the most utilized substrates by Brazilian producers for the acclimatization of orchids; however, both are considered endangered species and their collection is forbidden by the authorities. Therefore, the objective of this work was to evaluate the efficiency of alternative substrates in the development of Cattleya intermedia plantules during the acclimatization stage. The tested substrates were: tree fern fiber; sphagno; carbonized rice hull; pinus bark + coconut fiber (1:1 v v-1); pinus bark; coconut fiber. After 10 months, the following were evaluated: length of aerial part; length of the bigger root; number of pseudobulbs; number of roots; total fresh mass; pH of the substrate; electric conductivity of the substrate. It was verified that the substrate of coconut fiber and the mixture of pinus bark + coconut fiber (1:1 v v-1) are the most indicated as alternatives to tree fern fiber and sphagno for the cultivation of Cattleya intermedia during the acclimatization stage.
Cattleya; substrates; acclimatization