Soil Test Phosphorus as an Indicator of Nitrate-Nitrogen Leaching Risk in Tile Drainage Water
2010
Kinley, R. D. | Gordon, R. J. | Stratton, G. W.
A 2 year tile drainage study of 39 fields in Nova Scotia, Canada was conducted. Weekly nitrate-nitrogen (NO₃-N) concentrations were highest in spring and fall during high flow. Fields receiving poultry or swine manure had elevated drainage NO₃-N and soil test phosphorus. Water quality guidelines for NO₃-N (10 mg L⁻¹) were exceeded on 90% of rotations (corn-grass or corn-grain) and 13% of long-term cover fields. A significant correlation between NO₃-N and soil test P (r ² = 0.42; p < 0.001) was found. The 10 mg L⁻¹ guideline was exceeded at 100% of fields with soil test phosphorus >200 mg kg⁻¹ and 60% overall.
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