PHOTOSYNTHESIS: And Temperatures

Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin almost 8 years ago.

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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 rate may decrease. OR72-34
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Photosynthesis Comments
PHOTOSYNTHESIS: In Cattleyas 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 lux the rate of photqsynthesis increases to its maximum level; in winter the poorer level of light requires that plants be kept at 50 dF (lO dC). OR81-214 0
PHOTOSYNTHESIS: New Growths Stretch Towards the Window 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 0
PHOTOSYNTHESIS: Rates of Activity It starts functioning at 6 dF; at 62 dF it achieves 60% of full activity; at 70 dF it is 83%, at SO dF it is 100%, at 90 Deg. it is 80%, at lOOd it is 40% and at llOd it does not function. AU87(2)-17 0

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