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Design & Construction

In this unit, you will learn about common greenhouse irrigation systems. You will also learn about common water quality problems and how to correct them.

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Greenhouse Crops Irrigation

  1. Water Management

  2. Water Quality Issues and Recommendations
    • pH
    • Alkalinity (bicarbonate level)
    • Salinity
    • Level of potentially phytotoxic ions (B, Cl-, F-, Na+, and SO4-)
    • Iron
    • Bacteria and fungi
    • Algae

  3. Correcting Water Quality Problems
    • pH and Alkalinity
    • Salinity (E.C.)  
    • Phytotoxic ions 
    • Bacteria, fungi and algae
    • Ultra Violet Light
    • Slow Sand Filtration (Biofiltration)
    • Heat Treatment
    • Ultra-Filtration
    • Ozone
    • Chlorination
    • Chlorine dioxide
    • Bromine
    • Iodine
    • Copper ionization

  4. Common Irrigation Systems Used in Greenhouses
    • Hand watering
    • Overhead emitters
    • Irrigation booms
    • Drip tubes (Chapin or spaghetti tubes)
    • Capillary mat systems
    • Ebb-and-flow benches
    • Dutch trays
    • Troughs
    • Flood floors
    • Floating Beds
    • Root misting
    • Hanging basket

  5. Common Supporting Components of Irrigation Systems
    • Injectors
    • Stock tanks, holding tank and constructed
    • Filters
    • Solenoid valves
    • Pressure regulators
    • Clocks/computer controls  
    • Water meters 
    • Back-flow preventers 

  6. Special Considerations When Using Subirrigation and Recirulating Irrigation Systems