Category: Orchid Doctor

PHOTOGRAPHY: Of Orchids

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago For advice on various aspects, refer to A70-814+; A71-232+; A71-592+; A71-594+; A71-1095+; A72-582+; A74-4+; A74-614+; OD69-194,289; OD70-9O+; OD71-281+ Read More

PHOTOGRAPHY: Professional Advice

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Unusual pointers: on the tripod; white flowers differ from reds in photography; watching for shine on paphiopedilums; shadows and backdrops; black, floodlamps,different kinds of film; refer to OA82... Read More

PHOTOGRAPHY: Standard Backdrops

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Since the days of Dr. George Kennedy who photographed all his scientific shots against a black background, that color has been increasingly the preferred one for non-scientific illustration by maga... Read More

PHOTOPERIODICITY: Affected by Use of Electric Lamps

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A green lamp of low wattage can be used for working at night in a greenhouse; moderate light for about two hours before 10 o'clock or 11 o'clock has little effect, but more effect if burned in the ... Read More

PHOTOPERIODICITY: In Cattleyas

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Plants set their buds in a certain daylength; artificial light in a living room where plant is growing lengthens the day and prevents bud set. A70-344 Read More

PHOTOPERIODISM: Effects of Day Length

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago At three degrees north of the equator the difference between the shortest and longest days of the year is 20 minutes yet orchids bloom seasonally. A61-105 Read More

PHOTOPERIODISM: Hours of Complete Darkness Needed by Cattleyas

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago There is no generally recognized rule-of-thumb; in general 12 to 15 hours tend to favor flowering; eight to nine hours tend to stimulate vegetative growth; some summer-flowering cattleyas fall betw... Read More

PHOTOSYNTHESIS: And Temperatures

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago For every 18 deg.F. (10 deg.C.) rise, the rate of photosynthesis increases from 2.2 to 2.6 times, until 86 F. (30 C.) to 95 F. (35 C.) is reached when no further increase occurs; far above that the... Read More

PHOTOSYNTHESIS: In Cattleyas

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago They fix CO-two both day and night; the balance point of photosynthesis/food formation is at 200 lux, i.e., food formation is just equal to transpiration, at light intensities from 200 lux to 5000 ... Read More

PHOTOSYNTHESIS: New Growths Stretch Towards the Window

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago To keep plants grow ing upright when they are some distance from the light source rotate them one-quarter turn every two weeks; install Lazy Susans? A83-698 Read More