Elbs unit 1 b491 lesson 11 glasshouse crops

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GCSE ELBS UK Greenhouse growing foundation level

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Elbs unit 1 b491 lesson 11 glasshouse crops

  1. 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. 2. What we can control in a glasshouse? Pick 5 from: Light Sex of pests Temperature Humidity Water Altitude Bank rate Nutrients
  3. 12. What we can control in a glasshouse? <ul><li>Temperature </li></ul><ul><li>Light </li></ul><ul><li>Water </li></ul><ul><li>Nutrients </li></ul><ul><li>Air </li></ul><ul><li>This means that you are not limited by the </li></ul><ul><li>conditions outside and the growing season can </li></ul><ul><li>be lengthened. This may mean that a number of </li></ul><ul><li>crops can be grown each year. </li></ul>
  4. 13. Heating <ul><li>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. </li></ul><ul><li>Heating is used in the winter and spring to allow plants to germinate quicker than outdoor plants. </li></ul><ul><li>A heated propagator means that the whole greenhouse does not have to be heated. It works like a </li></ul><ul><li>mini greenhouse. </li></ul>
  5. 14. Making a propagator <ul><li>Use a seed tray and fill it with compost. </li></ul><ul><li>Plant seeds in the compost and water generously. </li></ul><ul><li>Cover the propagator with a plastic bag or clear plastic film. </li></ul><ul><li>Place the propagator in a warm place, such as on a warm </li></ul><ul><li>window sill. </li></ul><ul><li>Good seeds to use are peas, </li></ul><ul><li>beans, melons, or marrows. </li></ul>
  6. 15. More on greenhouse practice <ul><li>Soil warming cables can be put under the soil to heat the </li></ul><ul><li>unit. Cuttings can be put straight into compost. </li></ul><ul><li>A plastic cover helps keep the air moist. </li></ul><ul><li>Heaters can be used in conjunction with propagators, but </li></ul><ul><li>regard needs to be made for </li></ul><ul><li>safety and environmental cost. </li></ul><ul><li>Ventilation </li></ul><ul><li>Often done with windows. </li></ul><ul><li>Plants need oxygen for </li></ul><ul><li>respiration and carbon dioxide </li></ul><ul><li>for photosynthesis </li></ul>
  7. 16. Irrigation and lighting <ul><li>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. </li></ul>
  8. 17. Capillary matting <ul><li>Capillary matting is a means of self-watering. </li></ul><ul><li>One end of the roll of matting is placed in a water </li></ul><ul><li>trough. The water is drawn along the matting and </li></ul><ul><li>up through the pot bases by capillary action. </li></ul><ul><li>Seep hoses </li></ul><ul><li>These are hoses, connected to a supply, that </li></ul><ul><li>slowly leak the water in them to provide a constant </li></ul><ul><li>supply of water to the plants. </li></ul>
  9. 18. Lighting <ul><li>Artificial light can be provided in greenhouses to make </li></ul><ul><li>sure that plants have extra hours of light for growth. </li></ul><ul><li>Fluorescent lights are often linked to a time switch. </li></ul>
  10. 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

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