1. Functions of a Greenhouse
Horticulture II:

2. What does a Greenhouse DO?
What are its functions? - Make a list on the back of your handout.

3. To provide a protective environment for crop production.
Basic Function
To provide a protective environment for crop production.

4. Functions Temperature range needs to be conducive to plant production.
Ideal temperature 65 degrees-80 degrees
Moisture range is conducive to plant production
Watering
Humidity

5. Pest Control
Insects
Diseases
Weeds
Rodents

6. Nutrition In soil and water
In air – ventilation is necessary to supply carbon dioxide.

7. Expenses Labor is usually the greatest expense
Heat is usually the second highest expense

8. Greenhouse effect (front of HO)
The way greenhouses collect and store heat from the sun.
Radiant energy warms the greenhouse and its contents.
Greenhouses lose heat through the plastic, glass, etc. and additional heat has to be provided especially in winter.

9. 8.02-Temperature Controls
Heaters
Fans
Cooling Pads
Mechanical Air Conditioners
Ventilators
Shade Cloth
Fogging
Misting

12. 7.02-Environmental Controls
Thermostat-should be at plant level
Aspirated-small fan blows air continuously over temperature sensing unit for more uniform temperature
Thermistor-use of computers to monitor
Light
Photocell-measures light intensity (turns lights on and off)
Timer-turns lights on and off at a certain time
Moisture
Humidistat-controls fogging and misting to regulate relative humidity

14. 8.01-Maintenance Items Temperature Light Heaters-adequate clean fuel
Thermostats working properly
Fans, Fan motors, belts, etc-work
Cooling pads-adequate water and clean
Shade cloth-attached and is at right percentage
Light
Shade Cloth-attached or removed
Light bulbs-all work
Photocells & Timers-work correctly

15. 8.01-Maintenance Items Moisture Sanitation
Humidistat & Fogging/Mist Systems-work properly
Water lines & faucets-no leaks and adequate source of high quality and clean water
Sanitation
Diseases, Weeds & Insects-controlled by prevention methods

16. 8.02-Temperature, Light, & Moisture
Temp Controls
Heaters
Fans
Cooling pads
Mechanical air conditioners
Ventilators
Shade cloths & materials
Fogging and misting

17. Heaters , Fans and Cooling Pads

18. Ventilators, Shade Cloths, Foggers and Misters

19. 8.02-Temperature, Light, & Moisture
Light Controls
Lights
Shade cloth
Shade materials
Black cloth
Moisture Controls
Watering System
Foggers
Mist system
Humidifiers