Greenhouse Irrigation Practices The most important and often undervalued practice in controlled environment production.
Source: www.ualr.edu/~botany/ transpiration.jpg
UNDER-watering <ul><li>Plants can wilt </li></ul><ul><li>Plants can look OK, but stomates are closed more than normal </li...
Source:  weather.nmsu.edu/.../ stress_function.htm
Source:  weather.nmsu.edu/.../ stress_function.htm
OVER-watering <ul><li>Lush foliage, soft and susceptible to damage </li></ul><ul><li>Poor root aeration – increase in root...
Water Quality Parameters <ul><li>Soluble Salts (EC) </li></ul><ul><li>Alkalinity </li></ul><ul><li>Hardness </li></ul><ul>...
Soluble Salts (EC) <ul><li>Measured by determining electrical conductivity </li></ul><ul><li>For seedlings the maximum tol...
Soluble Salts (EC) <ul><li>When salt increases in the substrate it makes water uptake more difficult for the plants. Why? ...
Source: http://ss.jircas.affrc.go.jp
Source:  weather.nmsu.edu/.../ stress_function.htm
Source:  www.ces.ncsu.edu/.../ fig_water1.html
Source:  www.liv.ac.uk/ ~sd21/stress/salt.htm
Alkalinity <ul><li>Alkalinity is a separate term from pH </li></ul><ul><li>Measure of the facility of water to raise the p...
“ Hard” Water Issues <ul><li>High alkalinity – should test for hardness </li></ul><ul><li>Measure of calcium and magnesium...
 
Types of Irrigation Systems <ul><li>Hand watering </li></ul><ul><li>Drip Tube </li></ul><ul><li>Overhead Sprinklers </li><...
 
 
 
 
 
 
 
Source: http://www.bizave.com/vme/boom2.jpg
 
 
Image Source - http://www.igcusa.com
Source:  www.microgrow.com/ irrigation-controls.html   Source:  www.agrisupportonline.com/.../ soft_prod.htm
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Irrigation for the Greenhouse

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  • Most common cause of plant stress in the greenhouse environment; Under-watering can be a problem; Over-watering can be a problem; Once stressed plants may be morphologically and physiologically different. Wilting Leaf loss Premature flowering Flower abortion Necrotic lesions on stems an leaves (secondary pathogen attack) only in severest cases.
  • Irrigation for the Greenhouse

    1. 1. Greenhouse Irrigation Practices The most important and often undervalued practice in controlled environment production.
    2. 2. Source: www.ualr.edu/~botany/ transpiration.jpg
    3. 3. UNDER-watering <ul><li>Plants can wilt </li></ul><ul><li>Plants can look OK, but stomates are closed more than normal </li></ul><ul><li>Fruit cracking </li></ul><ul><li>Leaf abscission </li></ul><ul><li>Increase of disease and pest damage </li></ul>
    4. 4. Source: weather.nmsu.edu/.../ stress_function.htm
    5. 5. Source: weather.nmsu.edu/.../ stress_function.htm
    6. 6. OVER-watering <ul><li>Lush foliage, soft and susceptible to damage </li></ul><ul><li>Poor root aeration – increase in root rots </li></ul><ul><li>Increase run-off more waste </li></ul><ul><li>Less efficient use of nutrients </li></ul><ul><li>Over time even moderate amounts of over-watering can result in stunted plants </li></ul>
    7. 7. Water Quality Parameters <ul><li>Soluble Salts (EC) </li></ul><ul><li>Alkalinity </li></ul><ul><li>Hardness </li></ul><ul><li>Specific Elements </li></ul>
    8. 8. Soluble Salts (EC) <ul><li>Measured by determining electrical conductivity </li></ul><ul><li>For seedlings the maximum tolerance is 0.75 dS/m </li></ul><ul><li>For mature plants max tolerance is 1.5 dS/m </li></ul><ul><li>Salts are transferred to the substrate during watering – in addition to salts that build up from fertilization </li></ul>
    9. 9. Soluble Salts (EC) <ul><li>When salt increases in the substrate it makes water uptake more difficult for the plants. Why? </li></ul><ul><li>When salt levels in the solution are the same as solute levels in the roots – the plant can’t take up water – drought stress will occur even if the media is moist </li></ul><ul><li>Salt build up can be a particularly difficult issue in some bottom irrigation systems </li></ul>
    10. 10. Source: http://ss.jircas.affrc.go.jp
    11. 11. Source: weather.nmsu.edu/.../ stress_function.htm
    12. 12. Source: www.ces.ncsu.edu/.../ fig_water1.html
    13. 13. Source: www.liv.ac.uk/ ~sd21/stress/salt.htm
    14. 14. Alkalinity <ul><li>Alkalinity is a separate term from pH </li></ul><ul><li>Measure of the facility of water to raise the pH –Carbonate –Bi-carbonate </li></ul><ul><li>Very similar to applying limestone </li></ul><ul><li>me=milliequivalents of calcium carbonate </li></ul>
    15. 15. “ Hard” Water Issues <ul><li>High alkalinity – should test for hardness </li></ul><ul><li>Measure of calcium and magnesium in water (me of calcium carbonate) </li></ul><ul><li>For each part Mg there should be 3 to 5 parts Ca </li></ul><ul><li>If there is more calcium this can block plant uptake of Mg </li></ul><ul><li>Opposite problem and Ca uptake can be inhibited </li></ul>
    16. 17. Types of Irrigation Systems <ul><li>Hand watering </li></ul><ul><li>Drip Tube </li></ul><ul><li>Overhead Sprinklers </li></ul><ul><li>Boom Watering </li></ul><ul><li>Mat Watering </li></ul><ul><li>Ebb-and-Flood Systems </li></ul>
    17. 25. Source: http://www.bizave.com/vme/boom2.jpg
    18. 28. Image Source - http://www.igcusa.com
    19. 29. Source: www.microgrow.com/ irrigation-controls.html Source: www.agrisupportonline.com/.../ soft_prod.htm

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