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

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Presentation on theme: "Cranberry Station Phosphorus in Cranberry Nutrient Management Carolyn DeMoranville UMass Cranberry Station."— Presentation transcript:

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

2 2 Cranberry Station Why is this important?

3 3 Cranberry Station 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 4 Cranberry Station Results of surveys conducted in January 2008 (2007 season); January 2009 (2008 season); March 2010 (2009 season). season Management choice N:P P>N36%15% N:P P no more than N34%61% Plan to reduce P use next season36% Reduced P use51%65%

5 5 Cranberry Station Grower P reduction sites study P rate in kg/ha Site # P applied 2008 P applied 2009 P applied 2010 P applied 2011 P applied

6 6 Cranberry Station Through 2012 season

7 7 Cranberry Station Data from

8 8 Cranberry Station Standard range = 0.1 – 0.2% Tissue P % dry weight Site Avg. kg/ha P

9 9 Cranberry Station Comparison of TP in flood releases Years of P reduction Site

10 10 Cranberry Station Harvest flood P concentrations

11 11 Cranberry Station Winter flood P concentrations Note: scale is 10x less than for harvest flood

12 12 Cranberry Station Harvest flood 1 acre-foot = 1233 m 3 1 lb = 0.45 kg

13 13 Cranberry Station Change (kg/ha released) HarvestWinter Year Year Year Year Applied P Pre-2003 = 22 kg/ha Avg. starting 2003 = 11 kg/ha Site 1

14 14 Cranberry Station 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

15 15 Cranberry Station 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

16 16 Cranberry Station Questions?

17 Cranberry Bog Total Phosphorus CES/SMAST Field Expt. TP Fertilization (kg/ha/yr) TP incoming (kg/ha/yr) TP leaving (kg/ha/yr) TP export (net) (kg/ha/yr) Bog ID Mean EH PV BEN WS M-K ASH Mean A Flow-through Bog was found to have a higher annual TP loss of 9.9 kg/ha/yr (Howes & Teal 1995)

18 18 Cranberry Station Yield (Mg/ha) comparison of 4 or 6 years prior to that in Site P (kg/ha/yr) 4 years prior yield 6 years prior yield average 1 8.3* * **? 22.3** 710.3* * ** *


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