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Published byJasmine McDonough Modified over 11 years ago
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OMAF Nitrogen Verification Project Crop Technology Team 200 sites across Ontario (70 Hort) 3 years - 4 samples per year 2,400 soil samples!
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Nitrogen and Groundwater 23% of Ontario residents rely on groundwater 90% of rural residents 15% of rural wells above 10 ppm NO3-N nitrates are the main quality issue soils with high leaching potential are at most risk
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1992 Groundwater Survey - Nitrates 1296 Rural Wells % of wells with greater than 10 ppm nitrates
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Calculated Regional N Balance - OECD MacDonald, 2000
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Calculated N Balance - 1996 Source: Environmental Sustainability of Canadian Agriculture 69% of Ont farmland increased at least 5kg/ha between 1981 and 1996 % Ont Farmland 26% 22% 15% 37% 21 - 40
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Risk Assessment Residual N isnt necessarily the most accurate measure of risk on a farm-by farm basis Non- Farmers will use this data, unless given something better
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Measured Ontario Soil nitrate-N (kg/ha) 2001-2003
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Residual soil N, Hort sites, Nov 2002 Co-operator 60kg/ha A soil 80kg/ha B soil
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Next Steps Add 2004 data Add Survey information to the database Separate out specific production systems –identify efficiencies and leaks Target management systems to reduce risks
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Related Projects Cover Crops/Catch Crops
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Soil Nitrate Levels under Cover Crops (planted Aug.15, 2003 after cucumbers)
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Related Projects Cover Crops/Catch Crops Sweet Corn Nitrogen on-Farm Demonstration Trials 40 Years of Field Corn Nitrogen Database
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Related Projects Cover Crops/Catch Crops Sweet Corn Nitrogen on-Farm Demonstration Trials 40 Years of Field Corn Nitrogen Database Fertigation Scheduling in Melons & S.berries –Tissue/Petiole Recs vs. Weekly Program
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