The Orchid Doctor Articles under the Heading Light, Natural

Light, Natural Comments
LIGHT, NATURAL: And Epiphytes Requirements for optimum growth for high light and low light plants; theoretical; refer to A85-819 0
LIGHT, NATURAL: Characteristics And the reaction of different genera of plants to it outdoors and inside the greenhouse: vandas, cattleyas, phalaenopsis; on leaf burn; refer to AH86-97It consists of four P's: photosynthesis, in which water and carbon dioxide are brought together under light to form carbohydrates; photoperiodism, the relationship between day and night lengths; phototropism, the reaction of plants to the light source; and, phytochrome response, a blue pigment called phytochrome occurring in two forms, one producing optimum growth response, the other nullifying it. A66-910+; A72-243+ 0
LIGHT, NATURAL: Checking with a Light Meter After obtaining a reading, move the plants closer to or farther away from the source depending on requirements; at 1000fc, over 12 hours the exposure is 12,000fc.-hours per day; on a clear day in Florida garden plants take 150,000fc.-hours. AH86-99 0
LIGHT, NATURAL: For Cattleyas Young cattleyas can stand more light than mature plants, not less; no reason to shade them, except to watch the moisture content of small plants. A68-911 0
LIGHT, NATURAL: Intensity Plants respond to a scientifically balanced fertilizer if light is kept be low 2500 foot-candles or less for some genera during the hottest months. Au84-203 0
LIGHT, NATURAL: Morning Light Is Important The first light in the morning can be as strong as possible to start off the process of carbohydrate formation; light is much more intense at midday. AU79-37 0
LIGHT, NATURAL: Morning Light Preference Shown by Plants in Natural Habitat It is apparent when photographing plants on trees, they are located on the east side; in the greenhouse the best growing light is the morning light. A73-683; A73-781 0
LIGHT, NATURAL: Poor Conditions in Early Spring This causes growth changes in cymbidiums; April and May dullness retards growth appreciably for several years and may retard ripening and flowering for a year or more if the plants go out of phase. OR80-221; in culture. A81-640 0
LIGHT, NATURAL: Requirements A list of different varieties; the actual light requirements for species has hardly been determined; for other plants it has been done; for plants that grow best in full sun their leaves reach maximum photosynthesis at intensities well short of full sunlight such as 1,500 to 2,500fc.; consider the effect of shading, crowding and light reflection when trying to assess light requirements. A64-145Some genera need strong light: Ascocentrum, Brassavola, Dendrobium, Epidendrum radiatum, Encyclias, esp. E. cordigera, Laelia anceps, L. milleri, Oncidium species with thick leaves, Renanthera, Vanda. Fitch -- All about orchids.(j981)-30Some genera prefer shade: Anoectochilus, Gongora, Masdevallia, Paphiopedilum, Pleurothallis, Polyrrhiza, Stanhopea, Stelis, Fitch- All about orchids.(1981)-30 0
LIGHT, NATURAL: Requirements for Cattleyas An intensity of 2,000 to 3,000fc. is an excellent range; the higher the light the more cooling and ventilation required. A68-56 0
LIGHT, NATURAL: Requirements for Maximum Light For a review of excess or weak light effects and their results, refer to A67-468+; AH42+ 0
LIGHT, NATURAL: Sunlight Relative to Sun Hdat For a chart in foot candles of light related to BTU per square feet per hour, refer to A68-470 0
LIGHT, NATURAL: Transmission Through Plastic Films and Fiberglass Panels Data on 12 different greenhouse coverings; refer to A64-639+ see also Days,Short; Foot-candles reading; Photoperiodism; Phototropism; Reflective materials 0

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