Elbs unit 1 b491 lesson 11 glasshouse crops
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Elbs unit 1 b491 lesson 11 glasshouse crops

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GCSE ELBS UK Greenhouse growing foundation level

GCSE ELBS UK Greenhouse growing foundation level

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  • 1. ELBS Unit 1 B491 Lesson 11 Greenhouses. LOs 1. know how a glasshouse crop is grown (E-D) 2. understand how a glasshouse environment is controlled (D-C)
  • 2. What we can control in a glasshouse? Pick 5 from: Light Sex of pests Temperature Humidity Water Altitude Bank rate Nutrients
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  • 12. What we can control in a glasshouse?
    • Temperature
    • Light
    • Water
    • Nutrients
    • Air
    • This means that you are not limited by the
    • conditions outside and the growing season can
    • be lengthened. This may mean that a number of
    • crops can be grown each year.
  • 13. Heating
    • Heaters can be connected to a thermostat that turns them on when the temperature drops below a certain level and turns them off when the temperature is too high.
    • Heating is used in the winter and spring to allow plants to germinate quicker than outdoor plants.
    • A heated propagator means that the whole greenhouse does not have to be heated. It works like a
    • mini greenhouse.
  • 14. Making a propagator
    • Use a seed tray and fill it with compost.
    • Plant seeds in the compost and water generously.
    • Cover the propagator with a plastic bag or clear plastic film.
    • Place the propagator in a warm place, such as on a warm
    • window sill.
    • Good seeds to use are peas,
    • beans, melons, or marrows.
  • 15. More on greenhouse practice
    • Soil warming cables can be put under the soil to heat the
    • unit. Cuttings can be put straight into compost.
    • A plastic cover helps keep the air moist.
    • Heaters can be used in conjunction with propagators, but
    • regard needs to be made for
    • safety and environmental cost.
    • Ventilation
    • Often done with windows.
    • Plants need oxygen for
    • respiration and carbon dioxide
    • for photosynthesis
  • 16. Irrigation and lighting
    • Plants need continuous water to keep leaves turgid . Mist propagators have a fine spray of water that switches on when plants become dry. Humid air reduces transpiration and thus water loss. Cuttings lack roots are cannot replace lost water.
  • 17. Capillary matting
    • Capillary matting is a means of self-watering.
    • One end of the roll of matting is placed in a water
    • trough. The water is drawn along the matting and
    • up through the pot bases by capillary action.
    • Seep hoses
    • These are hoses, connected to a supply, that
    • slowly leak the water in them to provide a constant
    • supply of water to the plants.
  • 18. Lighting
    • Artificial light can be provided in greenhouses to make
    • sure that plants have extra hours of light for growth.
    • Fluorescent lights are often linked to a time switch.
  • 19. ELBS Unit 1 B491 Lesson 11 Greenhouses. LOs 1. know how a glasshouse crop is grown 2. understand how a glasshouse environment is controlled