HUMIDITY: Measurements and Accuracy

Culture Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin over 5 years ago.

Article Blog   Article Index
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
Share on Social Media:  
Log in to Add a Comment

More The Orchid Doctor Articles under the Heading Humidity

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: How to Lower It 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 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: 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

New Topics

  1. Gail Santini asked question Help ID this yellow phal. in category General Discussion
  2. Debra Johnson asked question Cattleya Alliance Members in category General Discussion
  3. Key Stage asked question Paph Harry Stage in category General Discussion
  4. Chris Tyrie asked question Plants for sale in category General Discussion
  5. Peter Collis asked question Parentage of Vandachostylis Conference Gold in category General Discussion

New Comments

  1. Susan LE commented on member plant QF Makani by Tanya Lam
  2. Pam Lipscomb commented on member plant Eny. Exotic Seashell by Steven Kirincich
  3. Pam Lipscomb commented on member plant Lc. Little Oliver by Steven Kirincich
  4. Susan LE commented on topic "Paph Harry Stage" by Key Stage
  5. Susan LE commented on scheduled event "Tamiami International Orchid Festival" by Miami Orchid Society
  6. Susan LE commented on article "Orchid Wiz - what will we do without you?" by Carol Holdren
  7. Susan LE commented on member plant Coel. rochussenii 'Waki' by Melvin Waki
  8. Susan LE commented on member plant Bsn. Maikai var. Louise by Sandi Block-Brezner
  9. Susan LE commented on member plant Rlc. Beauty Girl by Blanca Acosta
  10. Mary Lane commented on member plant Den. lindleyi by Mary Lane
  11. António Almeida commented on article "Angraecum Culture with Semi-Hydroponic Techniques" by Tom Kuligowski
  12. Pam Lipscomb commented on member plant Blc. Walden's Glen by Jeanne M Uzar
  13. Pam Lipscomb commented on member plant Blc. Oconee 'Mendenhall' by Jeanne M Uzar
  14. Pam Lipscomb commented on member plant Blc. Memoria Helen Brown var. Sweet Afton by Jeanne M Uzar
  15. Pam Lipscomb commented on member plant Blc. Magic Meadow 'Napolean' by Jeanne M Uzar
  16. Pam Lipscomb commented on member plant Ctt. Fire Dance 'Patricia' by Robert Rand
  17. Pam Lipscomb commented on member plant Bsn. Maikai by Robert Rand
  18. Pam Lipscomb commented on member plant Rth. Love-Love x Rth. Tsiku Lily by Robert Rand
  19. Carol Holdren commented on topic "Cattleya Alliance Members " by Debra Johnson
  20. Stefan Neher commented on orchid Bl. Joanne Singer