I. Title- GREENHOUSE MANAGEMENT-Basic Greenhouse Structures Frameworks – Unit 3 II. Situation Students have worked in greenhouse in Introduction to Horticulture and other classes. They have little to no experience with technical terms for types of green houses. III. Materials Students need paper and pencil for notes PowerPoint (Types of Greenhouses) Computer Poster Board Markers or pencils for drawing Plant list or Internet Handout for structure type IV. Vocabulary Anchor support post- side posts providing the main structural support for a greenhouse that are spaced at regular intervals and set in concrete footings Cold Frame- an outside propagation structure consisting of a wooden or concrete block frame with heat supplied by solar radiation through a glass or other transparent covering Even span- A single house that has a roof with an even pitch and even width Glass- a type of covering used in greenhouse; comes in several grades; allows greatest transmission of light Gothic arch- basic style of greenhouse with a pointed arch; trusses have been eliminated Hot bed- an outside propagation structure similar to a cold frame except electric or hot water thermostatically controlled heating is used Lean-to- shares a wall with a building and relies on the building structure to provide some support for the roof. Polyethylene- a petroleum-based flexible plastic used for many purposes; greenhouses can be covered with this Purlins- run the length of the structure and are attached to each truss, adding more structural strength Quonset- basic style of greenhouse with curved roof with or without sidewalls Ridge and Furrow Greenhouse- a number of greenhouses connected along the length of the house. Shared walls create larger interior space. Rigid structured sheets- a type of covering used in greenhouses commonly made of polycarbonate and acrylic; it is rigid and resistant to weathering Trusses- composed of rafters, chords, and struts that support the roof Uneven span- a house with unequal pitches and widths Ventilators- moveable units of greenhouse to allow for natural air flow V. Teaching Objectives 1. List and describe the different types of greenhouses on a quiz with 85 % accuracy. 2. List common framing materials used in greenhouses on a quiz with 90% accuracy. 3. Compare basic types of greenhouse coverings on a quiz with 80% accuracy. 4. Describe the uses of cold frames on a quiz with 80% accuracy. VI. Teacher Procedures A. Interest Approach 1. Students get out a piece of paper. 2. Have them draw every type of greenhouse they can think of. 3. Ask what each type is called. B. Reasons to Learn 1. Why are there different types of greenhouses? Different climates Different preferences Different capacity needs 2. Why do we need to know the different types of greenhouses? So we can know what kind we have or maybe need. 3. Why are there different materials used to frame greenhouses? Different cost Availability Appearance preference Strength requirements 4. Why are there different materials used to cover greenhouses? Cost Light requirements Durability 5. Why do we need to understand what a cold frame or a hotbed is? C. Questions to Answers 1. What are some different styles of greenhouses? Even span Uneven span Gothic arch Quonset Ridge and Furrow Lean-to 2. What are some factors to consider when choosing a greenhouse? Cost Space Location 3. What are some factors in choosing the framing material for a greenhouse? Strength Durability Maintenance Cost 4. What is glazing? Covering on a greenhouse 5. What is a cold frame? A small greenhouse used to protect plants or seeds from the environment 6. What is a hotbed? A small greenhouse used to protect plants or seed from the environment but uses outside source for heating. D. Solution to Problem GREENHOUSE STYLES 1. Lean-to Greenhouse- shares a wall with a building and relies on the building structure to provide some support for the roof. Advantages Cheapest Easier Instillation More Obtainable Space Disadvantage Cheapest Easier Instillation More Obtainable Space 2. Even Span Greenhouse- A single house that has a roof with an even pitch and even width Advantages Common Easy to find tables Easy to heat and ventilate Can add on easily Disadvantage Expensive More space needed 3. Uneven-Span Greenhouse- a house with unequal pitches and widths Advantages Can be used on uneven ground Can be situated to optimize sunlight Unique Disadvantage Expensive Difficult to find equipment Hard to add on to 4. Gothic Arch- basic style of greenhouse with a pointed arch; trusses have been eliminated Advantages Inexpensive Is good for shedding snow More attractive Disadvantages Less head room More difficult to build than Quonset 5. Ridge and Furrow Advantages Large Capacity Lower Energy Cost Ability to diversify plants grown Disadvantages Area needed to build Cost of building 6. Start Activity- DEVOLPING AND PLANING A GREENHOUSE 1. This will be used thought the semester and will be added to as more material is covered. 2. Students will be divided into groups 3. Poster board will be given out 4. Groups will be asked to choose a style of greenhouse that they would like 5. The choice will not be able to be changed and the area that the greenhouse is and the plants that will be grown is important 6. Groups will choose the types of plants that they would grow in the greenhouse 7. Groups will draw out their greenhouse choice, an exterior and interior view 8. Groups will be asked to write in a couple of paragraphs what they have chosen and their reasoning 9. Put the poster boards away that are finished FRAME TYPES 7. Wood Good Attractive Traditional Bad Expensive for treated wood Easily Rotted Heavy 8. Steel Good Inexpensive Bad Strong Can be galvanized Very Heavy Rusts Needs Some treatment(Painted) 9. Aluminum Alloys Good Non corrosive Low maintenance Bad Expensive Lower retention of heat GREENHOUSE GLAZING 10. Polyethylene Most Common Cheapest form of cover 11. Glass Best light transmission Most expensive 12. Rigid Structure Sheets Expensive High impact resistant Weather resistant 13. Continue Activity- DEVELOPING A GREENHOUSE 1. Have the students get into their groups and get their plans 2. Have them discuss the choice in style and well as the other decisions that they have made 3. Next the students need to decide what they will build their greenhouse out of. 4. After the decision is made the students need to write a paragraph or two on why they choose the materials that they did. VII. Summary A. What are styles different styles of greenhouses? B. What are the some of the advantages and disadvantages of the various styles? C. What are some of the different framing materials used in building a greenhouse? D. What are some of the advantages and disadvantages of each? E. What is glazing? F. What are the different glazing materials used on greenhouses? G. What are the advantages and disadvantages of the different glazing material? H. What are the differences in a cold frame and hotbed? VIII. Evaluation Student will have to turn in their written reasons for the chooses that they have made so far and justify all of their choices. Also they will turn in their drawings/plans for their greenhouse. IX. Handouts