It is the highest valued potted plant sold at auctions in The Netherlands and the most valued potted flowering plant in the United States ( United States Department of Agriculture, 2010). Phalaenopsis has become one of the most important floral crops in the world. Keywords: pH electrical conductivity orchids fertilization rhizosphere Therefore, the roots of Phalaenopsis may be the major contributor to substrate pH decline during production. Whether the substrate was exposed to light (clear pots) or not (opaque pots) had no effect on substrate pH, indicating that algae were not a factor in pH decline. Although the magnitude and course of pH decline were different in various substrates, the pH of sphagnum moss, artificial textile fiber, and pine bark substrates in which living plants were growing declined with time. Regardless of whether the sphagnum moss was fertilized, the pH of the substrate without plants increased as time progressed, whereas the pH of the substrate in which living Phalaenopsis plants were growing declined with time. The results showed that, although increasing fertilizer concentration resulted in a low initial pH (pH measured by the pour-through technique at first fertilization), fertilization itself was not the primary cause of the long-term pH decline. Sogo Yukidian ‘V3’, this study investigated if substrate, fertilization, light, and plant roots could be the cause of pH decline in the substrate. It is not understood what causes this decline in substrate pH. With a lengthened duration of cultivation, the pH of the moss gradually declines.
48: 289-302.Sphagnum moss has been used as the major substrate for cultivating Phalaenopsis spp. Evaporation from a sphagnum moss surface.
When the peat cores were maintained in the greenhouse for a year, changes in either the peat, the moss, or both occurred which resulted in significantly lower evaporation when measured in the growth chamber. The presence of an overstory of grasses and sedges protected the moss from desiccation when the water level was 15 cm below the surface, but had no effect on total water vaporization at any water level. Evaporation from the moss was less when the water level was at the surface of the peat than when it was lowered to 5, 10, or 15 cm below the surface. The energy used in evaporation from the moss exceeded net radiation except at 9☌. Evaporation from the moss increased 92% as the temperature was raised from 9° to 25☌. Under all conditions, evaporation from the moss surface was greater than that from a free-water surface. Peat cores, 45 cm in diameter, were collected from a sphagnum bog in northern Minnesota, and used to measure the effects of different temperatures and water levels on evaporation from a sphagnum moss surface in a growth chamber.
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