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11 - Greenhouses.pdf - What is a greenhouse Greenhouses...

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Greenhouses What is a greenhouse? ¤ Different names. Different definitions. Different functions? ¤ “Hothouse” ¤ “Glasshouse” ¤ “Greenhouse” ¤ Hothouse – a greenhouse maintained at a high temperature especially for the culture of tropical plants ¤ Glasshouse – European term for an artificially heated structure used for growing plants ¤ Greenhouse – a framed or inflated structure, covered by a transparent or translucent material that permits optimum light transmission for plant production and provides protection against adverse climatic conditions ¤ Greenhouses are means of overcoming climatic adversity using a free energy source - the sun (Hanan, 1998). ¤ A controlled growing environment whose purpose is to optimize plant production. Structural Materials ¤ Wood – Treated pine, redwood, cypress, cedar Structural Materials ¤ PVC
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Structural Materials ¤ Structural materials – Galvanized steel, aluminum Structural Materials Choosing Structural Materials ¤ Location, Location, Location 1. Maximize light entrance 2. Minimize shadows 3. Provide adequate support 1. Weight of covering 2. Snow and ice load 3. Wind Covering Materials ¤ Rigid 1. Acrylic 2. Glass 3. Polycarbonate ¤ Flexible 1. Polyethylene film 2. Shade cloth Covering Materials ¤ Acrylic Covering materials ¤ Glass
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Covering Materials ¤ Polycarbonate ¤ Single ¤ Double ¤ Triple Polycarbonate Covering Materials ¤ Polyethylene film ¤
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