Presentation on theme: "Greenhouse Structures. What does your house provide you with? What are the important features of a home that provide these things? What should a."— Presentation transcript:
What does your house provide you with? What are the important features of a home that provide these things? What should a greenhouse provide plants? What features could provide these things?
What are the common greenhouse types? A greenhouse is a structure enclosed by glass or plastic that allows light transmission for the growth of plants. There are four basic styles of greenhouse design. The lean-to greenhouse shares a wall with a building and relies on the building structure to provide support for the roof.
Courtesy, Interstate Publishers, Inc. Lean-to Greenhouse
Even-span greenhouse structures are single houses that have roofs with an even pitch and an even width. A common even-span greenhouse that uses arching pipes for the framework is called a hoop house.
Even Span Greenhouse Hoop house
Uneven-span greenhouses have unequal pitches and widths. Use of this style is limited to hillsides. Ridge-and-furrow greenhouse structures consist of a number of greenhouses connected along the length of the house.
Uneven Span Greenhouse Ridge and Furrow Greenhouse
Create a Greenhouse Use the marshmallows and toothpicks to create a greenhouse of one of the styles we have just discussed.
What considerations need to be addressed for greenhouse frameworks? The greenhouse framework supports the greenhouse covering material. The framework should be strong, yet allow the maximum amount of light to reach the plants.
Aluminum and aluminum/steel long lasting, low maintenance Wood Not used much anymore Angle iron Ornate but heavy Plastics Cheap but light and easily broken
What materials are used for greenhouse glazing? The covering of the greenhouse is referred to as the glazing. Considerations include: Durability Light transmission Cost Heating costs
Flexible sheets of polyethylene are stretched over the greenhouse framework. Structured sheets, including polycarbonate, acrylic, and fiberglass, which are made with double walls offer good insulation.
Polyethylene Good insulator Cheap Flexible Lasts 5-7 years
Polycarbonate structured sheets Most widely used Good light transmission Resist hail damage Easy to work with.
Polycarbonate sheets Box shaped tubes
Acrylic structured sheets High light transmission Cost more than polycarbonate sheets Prone to hail damage Less flexible than polycarbonate
Solid plastic sheets
Fiberglass Dropped in popularity Discolors after 7-10 years Flammable Poor insulator
Glass Best material for crop production Highest light transmission Long lasting Expensive Breakable
What are the functions of the headhouse? Headhouse Supports the production of greenhouse crops Attached to greenhouse Storage area Potting area Office Shipping area
What are the advantages of retractable-roof greenhouses? Retractable-roof greenhouse Allow the roof to be opened and closed.
Open the roof when weather conditions are favorable Close the roof when crops need protection
Provide plants with increased light levels and fresh air Prepare outdoor crops for elements before leaving the greenhouse Reduced disease problems Better ventilation Reduced irrigation Rainfall More effective temperature control for DIF.
What are greenhouse bench options? Bench Structure that holds the plants above the ground. Arranged with aisle space and growing space in mind Made of expanded galvanized steel Aluminum Plastic Rot resistant wood
Rolling benches maximize growing space by limiting space for aisles. The benches are placed on pipes, which allows them to be easily moved from side to side.