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Greenhouse Structures. 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?. Student Learning Objectives. 1. Identify greenhouse designs.

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Presentation Transcript
slide2
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?
student learning objectives
Student Learning Objectives
  • 1. Identify greenhouse designs.
  • 2. Identify considerations for greenhouse frameworks.
  • 3. Identify and describe greenhouse glazing materials.
objectives cont
Objectives Cont.
  • 4. Describe the functions of the headhouse.
  • 5. Discuss the advantages of retractable-roof greenhouses.
  • 6. Describe greenhouse bench options.
terms
Terms
  • Acrylic structured sheets
  • Bench
  • Even-span greenhouse
  • Fiberglass
  • Glass
  • Glazing
  • Greenhouse
terms1
Terms
  • Greenhouse framework
  • Headhouse
  • Hoop-house
  • Lean-to greenhouse
  • Polycarbonate structured sheets
  • Polyethylene
  • Retractable-roof greenhouse
terms2
Terms
  • Ridge-and-furrow greenhouse
  • Rolling bench
  • Structured sheets
  • Uneven-span greenhouse
what are the common greenhouse types
What are the common greenhouse types?
  • A greenhouseis 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 greenhouseshares a wall with a building and relies on the building structure to provide support for the roof.
slide9

Lean-to Greenhouse

Courtesy, Interstate Publishers, Inc.

slide10
Even-span greenhousestructures 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.
slide12
Uneven-span greenhouseshave unequal pitches and widths. Use of this style is limited to hillsides.
  • Ridge-and-furrowgreenhouse structures consist of a number of greenhouses connected along the length of the house.
slide13
Uneven Span Greenhouse

Ridge and Furrow Greenhouse

create a 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
What considerations need to be addressed for greenhouse frameworks?
  • The greenhouse frameworksupports the greenhouse covering material.
    • The framework should be strong, yet allow the maximum amount of light to reach the plants.
slide16
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
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

Start Here

slide18
Flexible sheets of polyethyleneare stretched over the greenhouse framework.
  • Structured sheets, including polycarbonate, acrylic, and fiberglass, which are made with double walls offer good insulation.
slide19
Polyethylene
    • Good insulator
    • Cheap
    • Flexible
    • Lasts 5-7 years
slide20
Polycarbonate structured sheets
    • Most widely used
    • Good light transmission
    • Resist hail damage
    • Easy to work with.
slide21
Polycarbonate sheets
  • Box shaped tubes
slide22
Acrylic structured sheets
    • High light transmission
    • Cost more than polycarbonate sheets
    • Prone to hail damage
    • Less flexible than polycarbonate
slide24
Fiberglass
    • Dropped in popularity
    • Discolors after 7-10 years
    • Flammable
    • Poor insulator
slide25
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 functions of the headhouse?
what are the advantages of retractable roof greenhouses
What are the advantages of retractable-roof greenhouses?
  • Retractable-roof greenhouse
    • Allow the roof to be opened and closed.
slide28
Open the roof when weather conditions are favorable
  • Close the roof when crops need protection
slide29
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

What are greenhouse bench options?
slide32
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.
slide33
Benchlayouts
    • conventional
    • Peninsular
    • Movable benches
review summary
Review/Summary
  • What are the common greenhouse sizes?
  • What considerations need to be addressed for greenhouse frameworks?
  • What materials are used for greenhouse glazing?
review summary cont
Review/Summary cont.
  • What are the functions of the headhouse?
  • What are the advantages of retractable-roof greenhouses?
  • What are greenhouse bench options?
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