Unit 8: Light

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Unit 8Light

• Greenhouse Management

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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.

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Objective 8.1Define photosynthesis

• Photosynthesis the process of converting air and
  sunlight into energy.

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Objective 8.2Explain the characteristics of
light and how it effects plant growth

• Intensity
• Duration
• Quality

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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

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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

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

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Objective 8.5Discuss ways to alter sunlight

• Shade cloth
• Grow lights
• Black-out cloth

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Chapter 9 Temperature
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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

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What causes desiccation

• When a temp continues to rise beyond the point
  that the plant can supply water fast enough for
  transpiration

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Are temp requirements the same throughout all
growing stages? Please explain.

• No

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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.
• DIFCloudy days 5 degree increase

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What may happen to a plant if the DIF is too
large?

• Some plants may seem to wilt while some may be
  permanently stunted.

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Unit 10Pesticide Use

• Greenhouse Management

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Objective 18.1Define pest

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

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Objective 10.2Define pesticide

• Pesticide
• Any agent used to remove or control a pest.

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Objective 10.3Identify the different types
pesticides

• Herbicide
• Insecticide
• Acaricide
• Avicide
• Miticide
• Fungicide
• Nematicide
• Bactericide

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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

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Cultural Pest Control

• Uses management techniques to control pests.

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Biological Pest Control

• Uses living organisms that are predators to
  control pests.
• Lady bugs
• Preying mantis

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Mechanical Pest Control

• Uses tools or equipment for control
• Plowing
• Mowing
• Mulching

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Chemical Pest Control

• Using chemical for pest control
• Insects
• Stomach poisons
• Contact poisons
• Systemic poisons
• Fumigants
• Plants
• Pre-emergence
• Post-emergence

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Genetic Pest Control

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

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Objective 10.5List the 3 signal words found on a
pesticide label

• Danger Highly Toxic
• Warning Moderately Toxic
• Caution Slightly Toxic

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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

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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