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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.

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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:

1 Greenhouse Structures

2  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?

3 Student Learning Objectives  1. Identify greenhouse designs.  2. Identify considerations for greenhouse frameworks.  3. Identify and describe greenhouse glazing materials.

4 Objectives Cont.  4. Describe the functions of the headhouse.  5. Discuss the advantages of retractable- roof greenhouses.  6. Describe greenhouse bench options.

5 Terms  Acrylic structured sheets  Bench  Even-span greenhouse  Fiberglass  Glass  Glazing  Greenhouse

6 Terms  Greenhouse framework  Headhouse  Hoop-house  Lean-to greenhouse  Polycarbonate structured sheets  Polyethylene  Retractable-roof greenhouse

7 Terms  Ridge-and-furrow greenhouse  Rolling bench  Structured sheets  Uneven-span greenhouse

8 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.

9 Courtesy, Interstate Publishers, Inc. Lean-to Greenhouse

10  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.

11  Even Span Greenhouse  Hoop house

12  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.

13  Uneven Span Greenhouse  Ridge and Furrow Greenhouse

14 Create a Greenhouse  Use the marshmallows and toothpicks to create a greenhouse of one of the styles we have just discussed.

15 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.

16  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

17 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

18  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.

19  Polyethylene  Good insulator  Cheap  Flexible  Lasts 5-7 years

20  Polycarbonate structured sheets  Most widely used  Good light transmission  Resist hail damage  Easy to work with.

21  Polycarbonate sheets  Box shaped tubes

22  Acrylic structured sheets  High light transmission  Cost more than polycarbonate sheets  Prone to hail damage  Less flexible than polycarbonate

23  Solid plastic sheets

24  Fiberglass  Dropped in popularity  Discolors after 7-10 years  Flammable  Poor insulator

25  Glass  Best material for crop production  Highest light transmission  Long lasting  Expensive  Breakable

26 What are the functions of the headhouse?  Headhouse  Supports the production of greenhouse crops  Attached to greenhouse  Storage area  Potting area  Office  Shipping area

27 What are the advantages of retractable-roof greenhouses?  Retractable-roof greenhouse  Allow the roof to be opened and closed.

28  Open the roof when weather conditions are favorable  Close the roof when crops need protection

29  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.

30 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

31

32  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.

33  Bench layouts  conventional  Peninsular  Movable benches

34 Review/Summary  What are the common greenhouse sizes?  What considerations need to be addressed for greenhouse frameworks?  What materials are used for greenhouse glazing?

35 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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