200 pt 300 pt 400 pt 500 pt 100 pt 200 pt 300 pt 400 pt 500 pt 100 pt 200pt 300 pt 400 pt 500 pt 100 pt 200 pt 300 pt 400 pt 500 pt 100 pt 200 pt 300 pt 400 pt 500 pt 100 pt Heating Systems Cooling System Watering Systems Curtains & Supplemental Lighting Miscellaneous
The way in which a greenhouse collects and stores heat from the sun.
greenhouse effect
Four types of fuel that can be used to heat a greenhouse.
Wood Electricity Coal Gas/Fuel Oil
Heats the greenhouse with individual heater units that produce infrared radiation.
Infrared radiant heaters
Localized heater unit that forces hot air directly into a duct system.
Forced-air heater
A thermostat is installed in each different zone to accommodate for temperature variations in the greenhouse.
Zoning
Bring in small amounts of cool outside air and mix it with the warm air already in the greenhouse.
Fan-tube ventilation
Large exhaust fans draw air through a moistened cellulose pad mounted on the opposite end of the structure.
Fan-and-pad cooling system
Fog is generated inside the greenhouse by spraying water at a high PSI through nozzles located in the greenhouse. As the fog droplets evaporate, heat is absorbed.
Fog-evaporative cooling system
As air heats up, it rises and exits through the vents located at the top of the greenhouse.
Natural ventilation
Explain the importance of keeping a greenhouse at the proper temperature.
The plants can only survive under certain temperature levels.
A form of sub-irrigation in which potted plants are set on a capillary mat, and water moves upward through the drain holes through a process called capillarity.
Capillary mat system
Name 3 types of water hoses.
Reinforced vinyl garden hose Reinforced rubber garden hose Polyurethane garden hose
A low-pressure system that applies a fine, fog type mist over plants.
Intermittent mist system
Water is carried to each pot by a microtube.
Tube irrigation
Equipment used for the irrigation of plants with exact proportions of fertilizers obtained from a concentrate of water-fertilizer.
Fertilizer-injector system
Name 3 types of curtains commonly used in a greenhouse.
Energy curtains Shade curtains Short-day curtains
Artificial lighting used to control the photoperiod for plants.
Supplemental lighting
The most efficient type of lighting because of its many benefits to the plants.
High intensity discharge lighting system
Inefficient type of lighting because it uses a lot of power to produce a little amount of light.
Incandescent lighting
Duration of time that light shines on a plant each day.
Photoperiod
This type of energy from the sun warms up the plants, soil, and other objects in the greenhouse.
Radiant energy
Used to control the desired temperature of the greenhouse.
Thermostat
Flats or pots are watered from the bottom and the water rises by capillary action.
Subirrigation
Water is applied over the canopy of the plants with spray nozzles.
Overhead watering
Three main reasons to ventilate a greenhouse.
To reduce the air temperature when it becomes too high. To exchange air to renew the supply of CO2 for photosynthesis. To reduce the relative humidity in the greenhouse as a means of controlling diseases.