National Water-Quality Assessment (NAWQA) Program
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Transport and Fate of Nitrate in a Glacial Outwash Aquifer in Relation to Ground-Water Age, Land Use Practices and Redox Processes
By Larry J. Puckett and Timothy K. Cowdery
[Journal of Environmental Quality, vol. 31, no. 3, p. 782-796 ]Figure 2. (a)Annual fertilizer nitrogen applications in Otter Tail county since 1945, and (b) cumulative nitrogen applications during the same period.
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