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Team Meeting #5, Great Lakes Protection Fund Grant A Phosphorus Soil Test Metric

Team Meeting #5, Great Lakes Protection Fund Grant A Phosphorus Soil Test Metric To Reduce Dissolved Phosphorus Loading to Lake Erie Heidelberg University July 23 and 24, 2013. Observations from the rivers: Implications of bioavailability, particulate P delivery, and seasonality.

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Team Meeting #5, Great Lakes Protection Fund Grant A Phosphorus Soil Test Metric

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  1. Team Meeting #5, Great Lakes Protection Fund Grant A Phosphorus Soil Test Metric To Reduce Dissolved Phosphorus Loading to Lake Erie Heidelberg University July 23 and 24, 2013 • Observations from the rivers: • Implications of bioavailability, particulate P delivery, and seasonality David Baker Project Director

  2. Topics 1. Bioavailable Phosphorus Export at Lake Erie Loading Stations 2. Particulate Phosphorus Delivery: Loading Station to Lake Observations of direct P fertilizer runoff 4. Seasonal aspects of precipitation, discharge and loading

  3. The Study Area: From Waterville to the Western Basin Study Topics 1. Trends in bioavailable P export at the Maumee Loading station. 2. Transport of Bioavailable P from Waterville to the Western Basin during storm events. Waterville tributary loading station for the Maumee River

  4. Major forms of phosphorus in river samples Total Particulate Phosphorus Total Dissolved Phosphorus Total Phosphorus = + Total Bioavailable Phosphorus Bioavailable Particulate Phosphorus Bioavailable Dissolved Phosphorus = + Dissolved Reactive Phosphorus Bioavailable P studies at Heidelberg Routine analyses at Heidelberg Focus on Storm Runoff Samples

  5. Dissolved Phosphorus Annual Loads Bioavailable Dissolved P (DHP) Total Dissolved P TDPY = DRPY x (TDPFWMC/DRPFWMC)Y BDPY = TDPY x (DHPFWMC/TDPFWMC)Y (DHPFWMC/TDPFWMC)Y (TDPFWMC/DRPFWMC)Y 1982 = 0.91 2010 = 0.97 1982 = 1.31 2010 = 1.10

  6. Particulate Phosphorus Annual Loads Bioavailable Particulate P Total Particulate P TPPY = TPY - TDPY BPPY = TPPY x 0.27

  7. Maumee River Annual Loads Total Bioavailable Phosphorus (TBP) Total Phosphorus (TP) TP is directly measured TBPY = BPPY + BDPY

  8. Maumee River at Waterville, Average Annual Loads, 2023-2012 Total Phosphorus 2,437 metric tons per year 45 % of Maumee TP is bioavailable Bioavailable Phosphorus 1,098 metric tons per year

  9. Maumee River at Waterville, Average Annual Loads, 2023-2012 Total Phosphorus 2,437 metric tons per year 33 % of Maumee TP is bioavailable at lake Bioavailable P Delivered to Lake Assumes 33% Delivery of PP 772 metric tons per year

  10. Average Annual Loads 2003-2012, Sandusky River at Fremont • Total Phosphorus • Annual Load = 608 metric tons • 1.88 kg/ha (1.67 lbs/acre) • 70 % total particulate P (1.17 lbs/acre) • 30 % total dissolved P (0.50 lbs/acre) TMDLs Nutrient Trading Target Loads • Total Bioavailable Phosphorus • Annual Load = 296 metric tons • 0.91 kg/ha (0.82 lbs/acre) • 43% bioavailable particulate P (0.32 lbs/acre) • 57% bioavailable dissolved P (0.47 lbs/acre)

  11. Observations of direct P fertilizer runoff

  12. Winter Broadcasting of fertilizer in the Lost Creek Watershed, 2010

  13. Some Fall Runoff Events from Honey Creek Dates custom applicators were in fields .

  14. 4. Seasonal aspects of precipitation, discharge and loading

  15. March 1-June 30 load 2010 2011

  16. Sandusky River Data

  17. Total Phosphorus 08/28/2007 – Bridgeman (6 stations) 08/29/2007 – Landsat Image 08/30/2007 – Vincent Transect 0.053 0.107 0.062 0.113 0.083 0.100 DRP TP 0.105 0.181 0.066 0.139 0.100 0.206

  18. Dissolved Reactive P. 08/28/2007 – Bridgeman (6 stations) 08/29/2007 – Landsat Image 08/30/2007 – Vincent Transect

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