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In order to assess the growth and flowering of ornamental orchids in peat alternative substrates, two cultivars of an ornamental orchid species, Doritaenopsis ‘Labois’ and ‘White Castle’, were cultivated in three different substrates: pure perlite, perlite + coir dust (3:1), and perlite + rockwool (3:1). Growth responses in terms of fresh and dry weight of shoots and roots were measured after 24 months of culture. Inflorescence size, number of flowers, flower diameter, and days to flowering were evaluated after 8/9 and 20 months (1st and 2nd flowering season, respectively). Plantlet growth response (fresh and dry weight of roots and shoots) was greatest in growing media containing perlite + rockwool (3:1) in both cultivars. Root development (root dry weight, number of roots, and root length) was drastically improved in perlite + rockwool (3:1), while perlite + coir dust (3:1) was found to be unfavorable for the growth and root development of these two cultivars. Growing media had no effect on inflorescence emergence during the 1st and 2nd flowering season in the two cultivars, but significant differences were observed in inflorescence length, number of stalks per plant, number of flowers per stalk, and flower diameter. The inflorescence length, number of flowers per florescence, and flower size significantly increased in plants grown in perlite + rockwool (3:1) during the 1st and 2nd flowering season, in both cultivars. Therefore, it can be concluded that the use of perlite + rockwool in professional horticulture contributes to their disposal in an environment-friendly way and also reduces the need for peat.

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Abstract
Introduction
Materials and Methods
Results and Discussion
Acknowledgements
Literature Cited

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UCI(KEPA) : I410-ECN-0101-2009-525-016909216