Slide Presentation

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AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia

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TABLE OF CONTENTS
  1. Water Quality and Herbicides
  2. A common question?
  3. Important Water Qualities
  4. Turbidity
  5. Water pH
  6. Alkaline Hydrolysis
  7. Water Hardness
  8. Ammonium Sulfate and Hard Water
  9. Water Conditioners
  10. In the absence of hard water, is AMS really needed?
  11. In the absence of hard water, is AMS really needed?
  12. Sample Water Quality Report
  13. Water pH and major cation concentrations of South Georgia Wells
  14. Check Labels
  15. Water Testing Labs
  16. Questions?



SLIDE CONTENTS
  1. Water Quality and Herbicides Eric P. Prostko Professor and Extension Weed Specialist Department of Crop & Soil Sciences
  2. A common question? Should I use AMS with that?
  3. Important Water Qualities turbidity pH hardness
  4. Turbidity Suspended solids, soil, and OM Can affect herbicides with high Koc values Paraquat Glyphosate Don’t use muddy water!
  5. Water pH Measurement of acidity/alkalinity <7.0 = acidic >7.0 = alkaline 7.0 = neutral 4.0 to 7.0 is fine Alkaline hydrolysis above 7
  6. Alkaline Hydrolysis Valor (flumioxazin) Soil-Water Half-Life pH 5.0 = 3.4 to 5.1 days pH 7.0 = 21.4 to 24.6 hours pH 9.0 = 12.6 to 22.0 minutes
  7. Water Hardness Measure of cations (+) in solution Ca, Mg, Fe, K, Na Can influence the performance of weak acids glyphosate glufosinate
  8. Ammonium Sulfate and Hard Water (NH4)2SO3 Overcomes antagonistic effects of cations How? Lowers pH NH4+ binds with herbicide SO4- binds with cations 8.5-17 lbs/100 gals (dry) 2.5-5.0 gals/100 gals (liquid)
  9. Water Conditioners CPS Non-AMS water conditioner 0.25% to 0.50% v/v ~$34/gal $0.85-$1.70/A – 10 GPA Helena Non-AMS water conditioner 0.25%-0.50% v/v ~$24/gal $0.60-$1.20/A – 10 GPA
  10. In the absence of hard water, is AMS really needed? AMAPA 19 DAT CN-10-13 AMS Xtra @ 2.5% v/v RUP = Roundup ATZ = Atrazine LBY = Liberty CAP = Capreno SFQ = Steadfast Q
  11. In the absence of hard water, is AMS really needed? Cadre 70DG 1.44 oz/A COC @ 1% v/v CASOB PE-08-04 AMS 100 DF @ 3 lb/A
  12. Sample Water Quality Report pH = 4.28 Hardness = 88 ppm CaCO3 Moderately hard (USGS) Using NDSU-AMS equation 0.3 lbs AMS/100 gals
  13. Check Labels
  14. Water Testing Labs UGA $20/sample Waters Agricultural Lab $38/sample
  15. Questions? eprostko@uga.edu www.gaweed.com