Interpreting Water Quality Reports

426 views

Published on

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

Published in: Education, Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
426
On SlideShare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
4
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Interpreting Water Quality Reports

  1. 1. Interpreting WaterQuality Reports<br />Karen L. Panter, Ph.D., C.P.H.<br />Horticulture and Specialty Crops<br />Department of Plant Sciences<br />
  2. 2. How do we measure water quality?<br />Alkalinity<br />Salinity<br />pH<br />Sodium Adsorption Ratio<br />Specific Ions<br />Suspended Solids<br />
  3. 3. Desirable Characteristics<br />EC<br /><0.5 dS<br />pH<br />5.0 – 7.0 <br />Alkalinity <br />40 – 100 ppm<br />Nitrate<br /><5 ppm<br />Magnesium<br /><24 ppm<br />Ammonium<br /><5 ppm<br />Phosphorus<br /><5 ppm<br />Potassium<br /><10 ppm<br />Calcium<br /><120 ppm<br />Sulfates<br />< 240 ppm<br />
  4. 4. Desirable Characteristics<br />Manganese<br /><2 ppm<br />Iron<br /><5 ppm<br />Boron<br /><0.8 ppm<br />Copper<br /><0.2 ppm<br />Zinc<br /><5 ppm<br />Molybdenum <br /><0.02 ppm<br />Aluminum<br /><5 ppm<br />Sodium<br /><50 ppm<br />SAR<br /><4<br />Chloride<br /><140 ppm<br />Fluoride <br /><1 ppm<br />
  5. 5. Desirable Characteristics<br />5<br />
  6. 6. pH<br />A pH reading is a measurement of the hydrogen ion concentration of a solution<br />0 most acid to 14 most basic<br />pH = 7 is neutral<br />pH = 5.4 to 7.0 acceptable<br />
  7. 7. Salinity<br />Total dissolved solids<br />Measured by electrical conductivity<br />determined by passing a current through the solution and determining its electrical conductance<br />units are millimhos/cm, or<br />decisiemens/meter (dS/m)<br />
  8. 8. Salinity<br />Restrictions to use:<br />< 0.25 dS/m None<br />0.25-0.75 dS/m Moderate<br />0.75-2.25 dS/m High<br />> 2.26 dS/m Severe<br />Multiply by 700 to convert to ppm TDS<br />Total Dissolved Solids<br />
  9. 9. Alkalinity<br />The ability to neutralize acid (meq·L-1) or ppm (upper limits)<br />total carbonates (CO3 )<br />bicarbonates (HCO3)<br />hardness (Ca + Mg)<br />Restrictions to use (in meq·L-1):<br />< 2 None<br />2-8.5 Slight to moderate<br />> 8.5 Severe<br />
  10. 10. SAR - Sodium Adsorption Ratio<br />Relates sodium to calcium and magnesium levels in water<br />Must be done by water testing laboratory<br />Can lead to deficiencies in calcium and magnesium<br />
  11. 11. Sodium Adsorption Ratio<br />High sodium in relation to calcium and magnesium can be detrimental to plant growth<br />SAR should be < 10<br />Greenhouse < 4<br />Calcium may precipitate<br />
  12. 12. Examples of Real Analyses<br />12<br />
  13. 13. 13<br />1<br />
  14. 14. 14<br />1<br />
  15. 15. 15<br />1<br />
  16. 16. 16<br />2<br />
  17. 17. 17<br />2<br />
  18. 18. 18<br />3<br />
  19. 19. 19<br />3<br />
  20. 20. 20<br />4<br />
  21. 21. 21<br />4<br />
  22. 22. 22<br />5<br />
  23. 23. 23<br />5<br />
  24. 24. 24<br />6<br />
  25. 25. 25<br />7<br />
  26. 26. 26<br />8<br />
  27. 27. 27<br />9<br />
  28. 28. 28<br />9<br />
  29. 29. 29<br />10<br />
  30. 30. 30<br />10<br />
  31. 31. 31<br />11<br />
  32. 32. 32<br />11<br />
  33. 33. And now….any questions?<br />33<br />

×