7Terms Ridge-and-furrow greenhouse Rolling bench Structured sheets Uneven-span greenhouse
8What 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.
9Lean-to GreenhouseCourtesy, Interstate Publishers, Inc.
10Even-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.
12Uneven-span greenhouses have unequal pitches and widths 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.
13Uneven Span Greenhouse Ridge and Furrow Greenhouse
14Create a GreenhouseUse the marshmallows and toothpicks to create a greenhouse of one of the styles we have just discussed.
15What 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.
16Aluminum and aluminum/steel Wood Angle iron Plastics long lasting, low maintenanceWoodNot used much anymoreAngle ironOrnate but heavyPlasticsCheap but light and easily broken
17What materials are used for greenhouse glazing? The covering of the greenhouse is referred to as the glazing.Considerations include:DurabilityLight transmissionCostHeating costsStart Here
18Flexible 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.
19PolyethyleneGood insulatorCheapFlexibleLasts 5-7 years
20Polycarbonate structured sheets Most widely usedGood light transmissionResist hail damageEasy to work with.
24Fiberglass Dropped in popularity Discolors after 7-10 years Flammable Poor insulator
25Glass Best material for crop production Highest light transmission Long lastingExpensiveBreakable
26What are the functions of the headhouse? Storage areaPotting areaOfficeShipping areaHeadhouseSupports the production of greenhouse cropsAttached to greenhouse
27What are the advantages of retractable-roof greenhouses? Allow the roof to be opened and closed.
28Open the roof when weather conditions are favorable Close the roof when crops need protection
29Provide plants with increased light levels and fresh air Prepare outdoor crops for elements before leaving the greenhouseReduced disease problemsBetter ventilationReduced irrigationRainfallMore effective temperature control for DIF.
30What are greenhouse bench options? Structure that holds the plants above the ground.Arranged with aisle space and growing space in mindMade ofexpanded galvanized steelAluminumPlasticRot resistant wood
32Rolling benches maximize growing space by limiting space for aisles 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.