Category: Orchid Doctor

HUMIDITY AND COOLING: A Review of Problems

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago The application of technique use of water coolers; pads; refer to A63-531+ Read More

HUMIDITY: Additional Amount Applied to Cattleyas

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 Read More

HUMIDITY: Altitude Difference

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 b... Read More

HUMIDITY: For Cattleyas

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 Read More

HUMIDITY: How to Lower It

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 Read More

HUMIDITY: Maintaining it

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 t... Read More

HUMIDITY: Maintaining it with a "gadget"

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 Read More

HUMIDITY: Measurements and Accuracy

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 Read More

HUMIDITY: New System

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 lo... Read More

ACID OR ALKALINE: Changing the Values

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Various means can be used: tufa, a limestone form, can be added to paphiopedilums from limestone cliffs; bark composts acidify with age; peatmoss, pine needles, oak leaves in the mix produce acidit... Read More