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  • Title: Soil test phosphorus as an indicator of nitrate-nitrogen leaching risk in tile drainage water.
    Author: Kinley RD, Gordon RJ, Stratton GW.
    Journal: Bull Environ Contam Toxicol; 2010 Apr; 84(4):413-7. PubMed ID: 20352185.
    Abstract:
    A 2 year tile drainage study of 39 fields in Nova Scotia, Canada was conducted. Weekly nitrate-nitrogen (NO(3)-N) concentrations were highest in spring and fall during high flow. Fields receiving poultry or swine manure had elevated drainage NO(3)-N and soil test phosphorus. Water quality guidelines for NO(3)-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 NO(3)-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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