Interpreting Water Quality Reports

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Slides from a presentation February 17, 2011 at the Wyoming Groundskeepers and Growers Association annual conference.

Slides from a presentation February 17, 2011 at the Wyoming Groundskeepers and Growers Association annual conference.

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Transcript

  • 1. Interpreting WaterQuality Reports
    Karen L. Panter, Ph.D., C.P.H.
    Horticulture and Specialty Crops
    Department of Plant Sciences
  • 2. How do we measure water quality?
    Alkalinity
    Salinity
    pH
    Sodium Adsorption Ratio
    Specific Ions
    Suspended Solids
  • 3. Desirable Characteristics
    EC
    <0.5 dS
    pH
    5.0 – 7.0
    Alkalinity
    40 – 100 ppm
    Nitrate
    <5 ppm
    Magnesium
    <24 ppm
    Ammonium
    <5 ppm
    Phosphorus
    <5 ppm
    Potassium
    <10 ppm
    Calcium
    <120 ppm
    Sulfates
    < 240 ppm
  • 4. Desirable Characteristics
    Manganese
    <2 ppm
    Iron
    <5 ppm
    Boron
    <0.8 ppm
    Copper
    <0.2 ppm
    Zinc
    <5 ppm
    Molybdenum
    <0.02 ppm
    Aluminum
    <5 ppm
    Sodium
    <50 ppm
    SAR
    <4
    Chloride
    <140 ppm
    Fluoride
    <1 ppm
  • 5. Desirable Characteristics
    5
  • 6. pH
    A pH reading is a measurement of the hydrogen ion concentration of a solution
    0 most acid to 14 most basic
    pH = 7 is neutral
    pH = 5.4 to 7.0 acceptable
  • 7. Salinity
    Total dissolved solids
    Measured by electrical conductivity
    determined by passing a current through the solution and determining its electrical conductance
    units are millimhos/cm, or
    decisiemens/meter (dS/m)
  • 8. Salinity
    Restrictions to use:
    < 0.25 dS/m None
    0.25-0.75 dS/m Moderate
    0.75-2.25 dS/m High
    > 2.26 dS/m Severe
    Multiply by 700 to convert to ppm TDS
    Total Dissolved Solids
  • 9. Alkalinity
    The ability to neutralize acid (meq·L-1) or ppm (upper limits)
    total carbonates (CO3 )
    bicarbonates (HCO3)
    hardness (Ca + Mg)
    Restrictions to use (in meq·L-1):
    < 2 None
    2-8.5 Slight to moderate
    > 8.5 Severe
  • 10. SAR - Sodium Adsorption Ratio
    Relates sodium to calcium and magnesium levels in water
    Must be done by water testing laboratory
    Can lead to deficiencies in calcium and magnesium
  • 11. Sodium Adsorption Ratio
    High sodium in relation to calcium and magnesium can be detrimental to plant growth
    SAR should be < 10
    Greenhouse < 4
    Calcium may precipitate
  • 12. Examples of Real Analyses
    12
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  • 33. And now….any questions?
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