Category: Orchid Doctor

PH (GENERAL): Conditions; Growing Under Controlled Levels

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 4.5 to 5.0 is "very strong acidity" and 5.0 to 5.5 is "strong acidity" and are the leveIs at which orchids grow better; indirectly, pH affects the availability of the fertilizer elements to the pla... Read More

PH (GENERAL): Cymbidium Compost

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago How to test for it: obtain a pH testing outfit from a scientific supply house, which includes a solution, color chart, barium sulfate, distilled water and test tubes; it has a possible accuracy rat... Read More

PH (GENERAL): In Nutrition of Seedlings

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago With a suitable medium, the growth and increments of weight of small plantlets are not affected by the initial pH. W9-67 Read More

PH (GENERAL): Meaning

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Alkalinity or acidity of a medium; 7 is neutral; values below 7 indicate acidity,- above 7, they indicate alkalinity; for orchid seed germination a pH of 4.8 to 5.5 is required; adjustments can be ... Read More

PH (GENERAL): Of Cymbidium Composts

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago The pH of many components are given their pH ratings over a period of time in composts, the effects of alkaline water resulting in high pH; refer to AU81-102 Read More

PH (GENERAL): Of Fertilizer

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A pH8 to 9 of the 30-10-10 fertilizer is natural and should not be adjusted because the alkaline state changes to the acidic side when used by the plant. A81-27 Read More

PH (GENERAL): Of Potting Mix

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Experiments show that if a recommended medium is chosen the initial pH should cause no concern. Hort. revs. 1983-195 Read More

PH (GENERAL): Potting Media

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Acidity, alkalinity and orchids: the definition of pH; the pH scale; pH and orchids; control of pH, etc.jrefer to AU80-37+Test for pH using litmus paper: soak several tablespoons of the media from ... Read More

PH (GENERAL): Testing by a Cheap Method

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Buy an aquarium test kit, complete with test tube, color code; it is accurate to one-tenth of a pH point; and an indicator; cost is about a dollar (in 1969); test media or water. A69-403 Read More

PH METERS: Electronic Type

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago How do they work? -- place a small amount of potting bark or tree fern in water enough to moisten the medium and the electrode or probe and test. A81-688 Read More