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Phosphorus in Cranberry Nutrient Management

Phosphorus in Cranberry Nutrient Management. Carolyn DeMoranville UMass Cranberry Station. Why is this important?. What have we done?. Plot scale work to define P requirement >0 but <22 kg Field-scale: Enlist growers to reduce well below 22 kg/ha (‘not to exceed’ level)

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Phosphorus in Cranberry Nutrient Management

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  1. Phosphorus in Cranberry Nutrient Management Carolyn DeMoranville UMass Cranberry Station

  2. Why is this important?

  3. What have we done? • Plot scale work to define P requirement • >0 but <22 kg • Field-scale: Enlist growers to reduce well below 22 kg/ha (‘not to exceed’ level) • Collect data from their farms • Crop yield • Tissue P • Water quality • Use these data to make the case for others to adopt reduced P

  4. Grower P reduction sites study P rate in kg/ha

  5. Through 2012 season

  6. Data from 2005-2011

  7. Standard range = 0.1 – 0.2%

  8. Comparison of TP in flood releases

  9. Harvest flood P concentrations

  10. Winter flood P concentrations Note: scale is 10x less than for harvest flood

  11. Harvest flood 1 lb = 0.45 kg 1 acre-foot = 1233 m3

  12. Site 1 Applied P Pre-2003 = 22 kg/ha Avg. starting 2003 = 11 kg/ha

  13. Potential impact • Site 1 • Bog is ~25 ha • In 2003, the 2 floods (winter/harvest) contained 117 kg P • 8 years later, the floods contained 17 kg P • 85% reduction

  14. Next steps • Continue and expand monitoring study, recruit growers to use 5 kg/ha P • Large grant to begin to install and evaluate methods to remove or minimize P from discharge water – filters, other BMPs

  15. Questions?

  16. Cranberry Bog Total Phosphorus A Flow-through Bog was found to have a higher annual TP loss of 9.9 kg/ha/yr (Howes & Teal 1995)

  17. *2008-2010 **2009-2011

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