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Potting media and post-transplantation growth of Dendrobium hybrid seedlings

By: Contributor(s): Material type: TextTextSubject(s): Summary: One-year-old hybrid seedlings raised in vitro, each with 4 leaves and 5 roots, were transplanted directly or after treatment with 0.1;Dithane M-45 (mancozeb) into 2-inch community pots containing 10 different media that had been treated with Dithane M-45. The materials comprised broken tiles, charcoal, coconut husks, coconut shells, fern roots, grass roots, gravel, moss, rubber seed husks and wood shavings. Data are tabulated on seedling survival (0/0) and growth parameters assessed after 9 months in nursery conditions of temperature between 29 and 35o C, RH between 70 and 90;, and illumination betwen 1000 and 1500 1x at pot level. Seedlings were watered daily and sprayed with an NPK nutrient solution on alternate days. Charcoal, followed by fern roots and rubber seed husks, gave the best results. Coconut husks, wood shavings, moss and grass roots were the least satisfactoy. Since charcoal and fern roots are, respectively, expensive and difficult to obtain (because of increasing forest clearence), it is recommended that rubber seed husks, gravel and coconut shells be need as cheap and abundant substitutes.
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One-year-old hybrid seedlings raised in vitro, each with 4 leaves and 5 roots, were transplanted directly or after treatment with 0.1;Dithane M-45 (mancozeb) into 2-inch community pots containing 10 different media that had been treated with Dithane M-45. The materials comprised broken tiles, charcoal, coconut husks, coconut shells, fern roots, grass roots, gravel, moss, rubber seed husks and wood shavings. Data are tabulated on seedling survival (0/0) and growth parameters assessed after 9 months in nursery conditions of temperature between 29 and 35o C, RH between 70 and 90;, and illumination betwen 1000 and 1500 1x at pot level. Seedlings were watered daily and sprayed with an NPK nutrient solution on alternate days. Charcoal, followed by fern roots and rubber seed husks, gave the best results. Coconut husks, wood shavings, moss and grass roots were the least satisfactoy. Since charcoal and fern roots are, respectively, expensive and difficult to obtain (because of increasing forest clearence), it is recommended that rubber seed husks, gravel and coconut shells be need as cheap and abundant substitutes.

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