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Trends in Nutrient Sources in The Chesapeake Bay Watershed

Trends in Nutrient Sources in The Chesapeake Bay Watershed. Factors Considered. Point Sources Non-Point Sources Agricultural manure and fertilizer Non-Ag Fertilizer (residential/commercial) Septic Systems Septic and manure are reported at 10 and 5 year intervals.

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Trends in Nutrient Sources in The Chesapeake Bay Watershed

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  1. Trends in Nutrient Sources in The Chesapeake Bay Watershed

  2. Factors Considered • Point Sources • Non-Point Sources • Agricultural manure and fertilizer • Non-Ag Fertilizer (residential/commercial) • Septic Systems • Septic and manure are reported at 10 and 5 year intervals. • Point sources and fertilizer are 1 year interval.

  3. Areas of Focus • Monitoring Stations at Fall Line • Potomac, Susquehanna, Patuxent, and James Rivers • Looked at total Nitrogen, total Phosphorus

  4. Methods (brief) • Ag fertilizer – calculated a Bay-wide application rate • Non-ag Fertilizer – applied fertilizer within the county of sale. • Manure - applied fertilizer within the county of generation. • Septic – Based on county population, distributed by low density residential. • Point Sources – within designated receiving water

  5. James River – NPS Nitrogen

  6. James River – Direct Nitrogen

  7. James River – NPS Phosphorus

  8. James River – Direct Phosphorus

  9. Patuxent River – NPS Nitrogen

  10. Patuxent River – Direct Nitrogen

  11. Patuxent River – NPS Phosphorus

  12. Patuxent River – Direct Phosphorus

  13. Potomac River – NPS Nitrogen

  14. Potomac River – Direct Nitrogen

  15. Potomac River – NPS Phosphorus

  16. Potomac River – Direct Phosphorus

  17. Susquehanna at Conowingo – NPS Nitrogen

  18. Susquehanna at Conowingo – Direct Nitrogen

  19. Susquehanna at Conowingo – NPS Phosphorus

  20. Susquehanna at Conowingo – Direct Phosphorus

  21. Future Trend Factors • Nutrient management/Soil testing • Phytase in Poultry • Precision feeding of cattle • Enhanced nutrient management, nutrient trading

  22. Fertilizer Sales Versus Crop Need

  23. Phytase Reduction in Poultry Litter α – No breakdown of percentages between species, turkey normally has higher P excretions/unit waste. β - Pennsylvania submitted results of assessment given by a feed industry representative, est. 90% adoption. γ - Post-phytase data for West Virginia data was for the period 2001 to 2004, assume phytase adoption overlap.

  24. Summary • In Bay watershed as a whole: Nitrogen total has increased slightly from early 1990s to present day, Phosphorus total has decreased slightly from an early 1990 peak. • In tributaries: mixed bag, some increases, some decreases. • Point Source phosphorus seems to be trending up. • Density of Nitrogen on a per acre basis has increased slightly for ag. Land. • Phosphorus decrease on a per acre basis on ag. land. • Density of application of N and P on urban land has increased substantially (20-50%).

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