Substratos alternativos ao xaxim para o cultivo de espécies do gênero Cattleya (Orchidaceae)

AUTOR(ES)

Mauren Sorace

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

31/03/2008

RESUMO

The use of alternatives beds for xaxim on culture of ornamental plants is a mean to contribute on environmental preservation, but it depends of studied vegetal specie and kind of ambience. Present work had the purpose to evaluate efficiency of different beds by vegetal origin, to grow species of orchids (Orchidaceae). Seedlings of Cattleya loddigesii, Cattleya skinneri and Cattleya intermedia X Hadrolaelia purpurata, obtained by in vitro culture, and acclimated, with medium height of 5 cm, were grown up in greenhouse with 60% of shadowness, using pots of polipropilene containing agricultural waste, at following treatments: 1- Defibered xaxim (control); 2- Carbonized rice husk; 3- Coconut fiber; 4- Husk pinus; 5- Carbonized rice husk + Coconut fiber (1:1, v:v); 6- Carbonized rice husk + Husk pinus (1:1, v:v); 7- Coconut fiber + Husk pinus (1:1, v:v); 8- Husk pinus + Carbonized rice husk + Coconut fiber (1:1:1, v:v). Experimental design was randomized with eight treatments and 12 repplications. Results were submited to variance analysis and Tukey test at 5 %. Growing parameters evaluated after 17 months were: heigher root length, roots number, height of aerial part, buds number, leaves number, higher leaf length, width of higher leaf, total fresh mass and root volume. Determinated beds parameters were: hydrogenionic potencial, eletric conductivity and density. Analysing results it conclude that all studied beds can be recommended to substitute xaxim but, that one composed by coconut fiber was least efficient to develop roots and aerial parts of plants. Better results were showed by beds only with the husk of pine and carbonized rice husk + husk pine on culture of C. loddigesii, C. skinneri and carbonized rice husk + husk pine on culture of Cattleya intermedia X Hadrolaelia purpurata.

ASSUNTO(S)

orquídea - cultivo substratos orchid culture plant growing media

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