Category: Orchid Doctor

GREENHOUSES: Energy Efficient

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Ten points emphasized for the Maryland area: the temperature below the earth frost line is 13 dC; solar energy is always available; a southern exposure is necessary; the sun's rays should strike th... Read More

GREENHOUSES: Epoxy Enamels as Paint on Wood

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Is used for boat bottoms, should do almost as well in greenhouses. A66-580 Read More

GREENHOUSES: Floors

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago The ideal is a floor dug down to three feet, filled in with a foot of large stones and two feet of pebbles; concrete and dirt floors tend to lower humidity. OIg88Feb-3 Read More

GREENHOUSES: Foundations Constructed of Creosoted Railway Ties

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago The creosote should be coated carefully with linseed oil; for added protection from the creosote fumes areas exposed on the inside should be covered with aluminum foil. A73-615 Read More

GREENHOUSES: Fumes -- Toxic Effect of Pesticide Smoke

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Their effects remain for about 12 hours; it is safe to enter 12 hours after using Plantfume #103. A78-403 Read More

GREENHOUSES: Glass Type Recommended

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A double-thick, regular, clear "B" quality glass is good. A64-975 Read More

GREENHOUSES: Heat Control

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Redistribution of the hot air in the apex of the house to the bench level is achieved by using the "Equal Heat" mechanism, for explanation refer to OR84-409 Read More

GREENHOUSES: Heat Loss Calculation

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A simple method: the heat loss in BTU's per hour is equal to the square feet of the glazed area X the temperature lift (raising greenhouse temperature above the average outside temperature) X 0.44 ... Read More

GREENHOUSES: Heating

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Transmission coefficients for materials; for a list of 34 materials and the degrees of heat loss; refer to OD71-192+ (See also Heating). 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