Greenhouse structures
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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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Greenhouse Structures

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Greenhouse structures

Greenhouse Structures


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

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.


Greenhouse structures

Lean-to Greenhouse

Courtesy, Interstate Publishers, Inc.


Greenhouse structures

  • 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.


Greenhouse structures

Even Span Greenhouse

Hoop house


Greenhouse structures

  • 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.


Greenhouse structures

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.


Greenhouse structures

  • 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


Greenhouse structures

  • 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.


Greenhouse structures

  • Polyethylene

    • Good insulator

    • Cheap

    • Flexible

    • Lasts 5-7 years


Greenhouse structures

  • Polycarbonate structured sheets

    • Most widely used

    • Good light transmission

    • Resist hail damage

    • Easy to work with.


Greenhouse structures

  • Polycarbonate sheets

  • Box shaped tubes


Greenhouse structures

  • Acrylic structured sheets

    • High light transmission

    • Cost more than polycarbonate sheets

    • Prone to hail damage

    • Less flexible than polycarbonate


Greenhouse structures

  • Solid plastic sheets


Greenhouse structures

  • Fiberglass

    • Dropped in popularity

    • Discolors after 7-10 years

    • Flammable

    • Poor insulator


Greenhouse structures

  • 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.


Greenhouse structures

  • Open the roof when weather conditions are favorable

  • Close the roof when crops need protection


Greenhouse structures

  • 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?


Greenhouse structures

  • 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.


Greenhouse structures

  • 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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