Controlled Environment Horticulture Flashcards
A structure with transparent covering that is used for growing plants under controllable conditions
Greenhouse
A collective term for two or more green houses at a single location belonging to the same owner
Greenhouse range
A transparent material used to cover a greenhouse frame
Glazing
And enclosed unheated covered frame used for growing and protecting young plants in early spring and for hardening off seedlings
Cold frame
A bed of soil enclosed in transparent material and heated to provide a warm medium for germination of seeds or rooting of cutting
Hotbed
Heat loss by transmission through a barrier such as a greenhouse glazing material
Conducting heat loss
The radiation of heat from a warm body such as a plant to a cooler body such as the glazing material of a greenhouse
Radiant heat loss
Pockets of low temperature in an enclosed area caused by nonuniform distribution of heat
Cold spots
A device used to regulate temperature
Thermostat
Plants that do not require a specific duration of dark for a response to occur but will respond faster if the dark is extended or shortened respectively
Facultative long and short night plants
A method of light application where the total duration of light is reduced by approximately 80% by replacing continuous lighting with intermittent lighting of about six cycles of five minutes of light and 25 minutes of darkness
Cyclic lighting
A device used in a fertigation system to control the rate of fertilizer applied through the system
Proportioner
The application of fertilizers in soluble form through an irrigation system
Fertigation
Deliberately increasing the carbon dioxide concentration in the air of the greenhouse to increase the rate of photosynthesis
Carbon dioxide fertilization
Greenhouse heat is lost through cracks and holes that occur in the structure
Infiltration
