unit 4 Greenhouse Sysytems
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| a form of sub-irrigation in which potted plants are set on a moist synthetic mat and water moves upward through the drain holes into the growing medium by wick action | Capillary mat system
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| automated system utilizing fabrics to insulate the greenhouse at night | Energy curtains
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| a system in which large exhaust fans draw air through a moistened cellulose pad mounted on the opposite end of the structure | Fan-and-pad cooling system
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| fans bring in small amounts of cool outside air and mix it with the warm air | Fan-tube ventilation
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| equipment used for the irrigation of plants with exact proportions of fertilizers obtained from a concentrate of water-fertilizer and water | Fertilizer injector system
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| cooler and more efficient that incandescent lights; have a wide range of wavelengths and long life | Fluorescent lighting
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| fog is generated inside; as the minute fog droplets evaporate, heat is absorbed | Fog-evaporative cooling system
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| localized heater units that force hot air directly into a duct system | Forced air-heaters
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| efficient and effective supplemental lighting system | High Intensity Discharge (HID) lightingsystem
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| manual watering of plants | Hose watering
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| water is heated in a boiler and pumped through pipes | Hot water heat
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| inefficient and gives off primarily infra-red wavelengths; often used for photoperiod control | Incandescent lighting
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| individual heater units that produce infrared radiation | Infrared radiant heaters
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| watering method; tiny droplets delivered periodically keep plants moist | Intermittent mist system
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| air is exchanged through open ridge and side vents and controlled by thermostats | Natural ventilation
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| water is applied over the canopy of the plants with spray nozzles | Overhead watering
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| watering around the outside of a flower bed | Perimeter irrigation
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| automated system utilizing fabrics to block light from reaching crops | Shade curtains
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| automated system utilizing fabrics to insulate the greenhouse at night | 19. Short-day curtains
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| water is applied to the growing medium by slowly saturating the medium | Soaker hose system
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| water heated to a boil and steam travels through pipes in the greenhouse | Steam heat
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| water is carried to each pot by a microtube; foliage is not wet in this process | Tube irrigation
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