Category: Culture

PERLITE: As a Culture Medium

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Coarse perlite alone with a half-inch topping of pea-gravel makes for a healthy root system on a cattleya with normal watering and feeding;a test of two parallel sets of phalaenopsis plants, one in... Read More

PERLITE: Opinions of the Experts

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Some use up to 50% in cynbidium mixes and get excellent results; the horticultural grade #3, is coarse and stimulates root development; several growers believe it retains too much moisture at the b... Read More

PERLITE: As Potting Medium

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Screen out the fines through a window-screen mesh; place some drainage in the bottom of the pot; position the plant then pour in the Perlite to within an inch of the pot top then cover with half an... Read More

PERLITE: As Potting Mix

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A processed volcanic material, sized, but best for orchids over one-eighth inch in size; inert; inorganic; requires a balanced fertilizer such as 20-20-20 if used alone; mainly used as an ingredien... Read More

PH (GENERAL): And Acidity

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago For results of tests, soil chemistry data, chemicals, availability chart of nutrients relative to a situation, refer to AU85(1)-10 Read More

PH (GENERAL): Buffering

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Most organic media have a high cation exchange and they buffer against nutrient and pH levels; for water, best growth follows the use of a pH level of 6 to 7. A85-1435 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): 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): 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