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Plant Science 1024 Test 3 Notes

by: Emily Geels

Plant Science 1024 Test 3 Notes AGPS 1024-001

Emily Geels
Arkansas Tech University
GPA 3.73

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Here are the notes for the week of March 7th.
Principles of plant science
Dr. Collins
Class Notes
plant science
25 ?




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This 3 page Class Notes was uploaded by Emily Geels on Friday March 11, 2016. The Class Notes belongs to AGPS 1024-001 at Arkansas Tech University taught by Dr. Collins in Spring 2016. Since its upload, it has received 13 views. For similar materials see Principles of plant science in Agriculture and Forestry at Arkansas Tech University.

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Date Created: 03/11/16
Plant Science 1024 with Professor Collins Test #3 Material I. Greenhouse Management A. Plant growing structures 1. Hotbed a. Start cuttings b. Inexpensive c. Heated by cables underneath 2. Cold frame a. Hot bed without cables 3. Shade house/lath house a. Shade house has a woven, plastic saran fabric (different densities for different regions) i. No cooling or heating ii. Used for shade plants and nursery containers iii. Used as halfway house for field crops b. Lath house must have square prism design i. Lattice wood strips ii. Spacing of lattice will determine shade iii. Can cut out 1/3 to 2/3 natural light 4. Greenhouse a. Freestanding (commercial) b. Lean-to (domestic) c. Framework is usually wood/aluminum/steel d. Coverings: i. Glass (most expensive) - Must be framed - Durable, but will break ii. Fiberglass - Can be molded over a semi-circle house (Quonset) - Will pith over time (discolor) - Very flammable iii. Polyethylene - Cheaper than glass - Different grades - More expensive grade will last longer iv. Double layer covering - Watch stress points e. Cooling i. Pad and fan-water evaporation f. Heating i. Even in the winter, a greenhouse needs ventilation to prevent clammy/saturated air. ii. Two thermostats per house - In winter only one fan will run - In summer everything comes on - Drip system will activate if needed iii. Each heater has its own thermostat iv. Thermostat placement is important - Center of house - Plant height B. Artificial lighting 1. Can be used to supplement natural light a. Supplements photosynthesis b. Manipulates photosynthesis i. Photoperiodic- plants that require a certain amount of light to bloom ii. Three types: - Short day/long night  Poinsettias  >12 hours of darkness - Long day/short night  >12 hours daylight - Day neutral c. Different lamps vary in wavelength i. Florescent - Inefficient - Use less energy - Both photosynthesis and photoperiod ii. Incandescent - Get hot - 1/3 less efficient iii. High intensity discharge (HID) - Used for large areas - 5x more intense C. Directing plant growth 1. Reasons to control plant growth a. Restricting growth to a proper scale b. Plant health (manage/prevent disease) c. Quantity of flowers/fruits will improve 2. Pruning terms a. Topiary b. Espalier c. Cordon ((grape) espalier) d. Bonsai- ancient art of dwarfing trees to miniatures through pruning and wiring e. Root pruning- (nursery plants) f. Shoot pruning- pruning top growth i. When to prune - Fruit trees when dormant - Spring flowers after bloom g. Heading back- cutting back to a bud h. Thinning out- cutting back to the original stalk i. Sucker- a nonproductive branch that comes directly from the root system j. Water sprout- whip-like looking, nonproductive branches that come from another stem k. Central leader system- just one main trunk (coconut tree) l. Modified central leader- several main scafolded stems coming of the base trunk m. Vase system- cut of one branch, and two more shall grow in its place (like shape)


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