HUMIDITY: How to Lower It

Culture Orchid Doctor

by Robert M. Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin over 3 years ago.

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An air conditioner is needed, but plants prefer high humidity, with good air movement and with fans acting against condensation, which might favor the development of disease A67-139
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Humidity Comments
HUMIDITY: Additional Amount Applied to Cattleyas Do not use a tank-like enclosure; partially enclose the plant; if leaves are firm use a tray with pebbles and place the plant on it; if the room is dry add a humidifier. A70-235 0
HUMIDITY: Altitude Difference At sea level, which is where the phalaenopsis mostly grow, 100% relative humidity means a lot more water vapour per unit volume of air than at an altitude higher up, so there is a vast difference between 100% at sea level and 100% at 10,000 feet where the masdevallias thrive. OR82-27; A81-793 0
HUMIDITY: For Cattleyas Set the humidifier at 70% relative humidity if the humidistat is reliable, and sensitive; set at 60% to 70% on one that is not. A65-438; phalaenopsis and cattleyas. A80-630 0
HUMIDITY: Maintaining it The relative ineffectiveness of "damping down" compared with using misters; at 5,000 feet altitude or more the amount of water carried by the air can be about one-third reduced; to maintain it in the greenhouse various devices are available, such as a time-switch, a micronic timer, a solenoid valve, atomising water-jets, etc., refer to OR87-120 0
HUMIDITY: Maintaining it with a "gadget" A canvas soaker hose fastened to the top row of the finned heating pipes and with a slight flow of water leaking from it raised the humidity of a test area from 20% to 60%. A59-514 0
HUMIDITY: Measurements and Accuracy The often inaccurate needle-and-dial hygrometer can be calibrated in a jar using common chemical saturated solutions of known % relative humidity at 25 dC. A80-1382 0
HUMIDITY: New System Install a fan on the floor pointing upwards, with overhead water sprays not directed onto the- plants, so that humidity is increased to about 907o relative; this produces increased growth and no losses; refer to A85-960 0
HUMIDITY: Providing it Automatically One system uses three mist sprays per nine feet of length on each side of the greenhouse, activated by means of a solenoid valve controlled by a humidistat sensor; the standard hook-up. OR85-418 0

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