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Unit 8: Light

Unit 8: Light. Greenhouse Management. Objectives. Objective 8.1 Define photosynthesis. Objective 8.2 Explain the characteristics of light and how it effects plant growth. Objective 8.3 Describe the light requirements of a plant. Objective 8.4 Explain the effect of day length on plant growth.

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Unit 8: Light

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  1. Unit 8:Light Greenhouse Management

  2. Objectives • Objective 8.1Define photosynthesis. • Objective 8.2Explain the characteristics of light and how it effects plant growth. • Objective 8.3Describe the light requirements of a plant. • Objective 8.4Explain the effect of day length on plant growth. • Objective 8.5Discuss ways to alter sunlight.

  3. Objective 8.1Define photosynthesis • Photosynthesis: the process of converting air and sunlight into energy.

  4. Objective 8.2Explain the characteristics of light and how it effects plant growth • Intensity • Duration • Quality

  5. Objective 8.3Describe the light requirements of a plant • Light compensation point • Point at which the plant produces enough energy to meet respiration needs. • Light saturation point • Point at which no more photosynthesis can take place

  6. Objective 8.4Explain the effect of day length on plant growth • Short-Day Plants (SDP) • Flowers when the day length is shorter than a crucial number of hours. • Poinsettias & mums • Long-Day Plants (LDP) • Flowers when the day length is longer than a crucial number of hours. • Begonias & spinach

  7. Day-Neutral Plant (DNP) • Day length does not effect the flowering of a plant. • African violets & roses

  8. Objective 8.5Discuss ways to alter sunlight • Shade cloth • Grow lights • Black-out cloth

  9. Chapter 9 Temperature

  10. What are three basics of temp? • Minimum level at which, if the temp is below, growth does not take place • Optimum level at which the plant grows best • Maximum level at which the plant no longer grows

  11. What causes desiccation • When a temp continues to rise beyond the point that the plant can supply water fast enough for transpiration

  12. Are temp requirements the same throughout all growing stages? Please explain. • No

  13. Why should one keep the temp over night? How large of a DIF should one use in a greenhouse? • The cooler temps at night reduce respiration and saves more energy while the plant is not producing food. The higher clay temp maximizes photosynthesis. • DIF=Cloudy days 5 degree increase

  14. What may happen to a plant if the DIF is too large? • Some plants may seem to wilt while some may be permanently stunted.

  15. Unit 10:Pesticide Use Greenhouse Management

  16. Objective 18.1Define pest • Pest: • Anything that it actions or presents is undesirable. • I.e. Bermuda grass in a flower bed is a pest

  17. Objective 10.2Define pesticide • Pesticide: • Any agent used to remove or control a pest.

  18. Objective 10.3Identify the different types pesticides • Herbicide • Insecticide • Acaricide • Avicide • Miticide • Fungicide • Nematicide • Bactericide

  19. Objective 10.4List and explain the different means of controlling pests • Cultural Pest Control • Biological Pest Control • Mechanical Pest Control • Chemical Pest Control • Genetic Pest Control

  20. Cultural Pest Control • Uses management techniques to control pests.

  21. Biological Pest Control • Uses living organisms that are predators to control pests. • Lady bugs • Preying mantis

  22. Mechanical Pest Control • Uses tools or equipment for control • Plowing • Mowing • Mulching

  23. Chemical Pest Control • Using chemical for pest control • Insects • Stomach poisons • Contact poisons • Systemic poisons • Fumigants • Plants • Pre-emergence • Post-emergence

  24. Genetic Pest Control • The management of biological systems • Genetic manipulation to make plants resistant to specific pests.

  25. Objective 10.5List the 3 signal words found on a pesticide label • Danger = Highly Toxic • Warning = Moderately Toxic • Caution = Slightly Toxic

  26. Objective 10.6List the proper equipment and clothing to use when applying pesticides • Long-sleeved shirt • Long-legged pants • Gloves • Goggles • Respirator • Hat • Rubber boots

  27. Objective 10.7Explain the importance of pesticide label information • Protects the applicator and those within the area • Some pesticides may “walk” or drift up to 4 miles. • Maximizes effectiveness • Prevents tolerance build up by pests • Maximizes economical returns • Reduces environmental containmination • Protects non-targeted wildlife and plants

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