Light in the Greenhouse
Energy Relationship of Photosynthesis and Respiration Carbohydrate Respiration Photosynthesis CO  +  H O 2 2 2 O 1_2 LOW H...
Best case scenario: <ul><li>CO 2  levels are optimum </li></ul><ul><li>Irrigation is optimum </li></ul><ul><li>Available n...
 
 
Growing Plants under Artificial Lights <ul><li>Intensity </li></ul><ul><li>Duration </li></ul><ul><li>Quality </li></ul>
Light Quality <ul><li>Classified according to wavelength </li></ul><ul><li>Primarily the visible spectrum of light is used...
 
http://www.wfu.edu/users/mcguaf1/images/PhotosynthesisActionSpectrum.gif
http://courses.cm.utexas.edu/jrobertus/ch339k/overheads-3.htm
Maximizing Light Intensity in the Greenhouse Environment <ul><li>Greenhouse design </li></ul><ul><li>Clean Glass </li></ul...
Light Intensity Reduction <ul><li>Frame – 10% </li></ul><ul><li>Glass – 7% </li></ul><ul><li>Sash Bars – 5% </li></ul><ul>...
 
 
 
Reducing Light Intensity <ul><li>Spray shading compounds on the actual greenhouse (white paint and water was common) </li>...
 
 
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Light In The Greenhouse

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Biology of Light in the Greenhouse

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  • Light In The Greenhouse

    1. 1. Light in the Greenhouse
    2. 2. Energy Relationship of Photosynthesis and Respiration Carbohydrate Respiration Photosynthesis CO + H O 2 2 2 O 1_2 LOW HIGH Energy 2H + 2H + 2 O 1_2
    3. 3. Best case scenario: <ul><li>CO 2 levels are optimum </li></ul><ul><li>Irrigation is optimum </li></ul><ul><li>Available nutrient levels are optimum </li></ul><ul><li>Optimum light intensity </li></ul><ul><ul><li>Too much light lowers net photosynthesis </li></ul></ul><ul><ul><li>Too little light lowers net photosynthesis </li></ul></ul><ul><ul><li>Actual optimum level varies, by species, growth stage location on plant </li></ul></ul>
    4. 6. Growing Plants under Artificial Lights <ul><li>Intensity </li></ul><ul><li>Duration </li></ul><ul><li>Quality </li></ul>
    5. 7. Light Quality <ul><li>Classified according to wavelength </li></ul><ul><li>Primarily the visible spectrum of light is used for photosynthesis </li></ul><ul><li>Don’t forget about red and far red light and the special signals provided to plants </li></ul>
    6. 9. http://www.wfu.edu/users/mcguaf1/images/PhotosynthesisActionSpectrum.gif
    7. 10. http://courses.cm.utexas.edu/jrobertus/ch339k/overheads-3.htm
    8. 11. Maximizing Light Intensity in the Greenhouse Environment <ul><li>Greenhouse design </li></ul><ul><li>Clean Glass </li></ul><ul><li>Plant Spacing </li></ul>
    9. 12. Light Intensity Reduction <ul><li>Frame – 10% </li></ul><ul><li>Glass – 7% </li></ul><ul><li>Sash Bars – 5% </li></ul><ul><li>Overhead equipment – heaters, reflective cloth, fans, etc. </li></ul><ul><li>Geographic orientation of greenhouse </li></ul>
    10. 16. Reducing Light Intensity <ul><li>Spray shading compounds on the actual greenhouse (white paint and water was common) </li></ul><ul><li>Using shade cloth </li></ul>

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