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O objetivo deste trabalho foi avaliar a eficiência dos substratos à base de coco no cultivo de Dendrobium nobile. As mudas foram cultivadas em vasos de polipropileno, permanecendo em viveiro com 50% de luminosidade. Os substratos utilizados foram: xaxim desfibrado (testemunha), coco desfibrado, coco em pó e coco em cubos (coxim). Após oito meses do início do experimento, as variáveis avaliadas foram: altura das plantas, diâmetro dos pseudobulbos, número de brotos, peso de matéria seca das raízes, comprimento da maior raiz e pH dos substratos. O delineamento experimental foi inteiramente casualizado, com sete tratamentos e dez repetições. Os dados foram submetidos à análise de variância, complementada pelo teste de Tukey a 5%. Os resultados obtidos mostraram que os substratos coco desfibrado e coco em pó + coco em cubos podem ser utilizados no cultivo de Dendrobium nobile Lindl., preservando-se o samambaiaçu (Dicksonia sellowiana Hook), do qual é extraído o xaxim.The objective of this study was evaluate the efficiency of coconut-based substrates in the cultivation of Dendrobium nobile. Seedlings were cultivated in polypropylene vases, kept in screen shadowed nursery by a 50% of lighting. The substrates used were: defibered tree fern (control), defibered coconut, powdered coconut and cubed coconut (coxim). The variables were assessed eight months later were: plant height, pseudobulb diameter, sprout number, root dry weight, biggest root length and substrates pH. The experiment was completely randomized, with seven treatments and ten replicates. The data were submitted to analysis of variance, complemented by the Tukey test at 5%. The results show that the substrates defibered coconut and  powdered coconut + cubed coconut may be used in Dendrobium nobile Lindl. culture, preserving thus the samabaiaçu (Dicksonia sellowiana Hook.), from which the tree fern fiber (xaxim) is extracted

Utilização de substratos à base de coco no cultivo de <em>Dendrobium nobile</em> Lindl. (Orchidaceae)