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  • Row crops, field tiles causing water quality problems, studies say

    Average annual predicted January to June total P (A), dissolved reactive P (B), and particulate P (C) yields for the counties in the Mississippi River basin from 1997 to 2006.

    Average annual predicted January to June total P (A), dissolved reactive P (B), and particulate P (C) yields for the counties in the Mississippi River basin from 1997 to 2006.

    Image courtesy Mark David

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      Average annual predicted January to June total P (A), dissolved reactive P (B), and particulate P (C) yields for the counties in the Mississippi River basin from 1997 to 2006.

      Image courtesy Mark David

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      Mark David, a biogeochemist in the department of natural resources and environmental sciences

      Photo by David Riecks

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      Average annual fertilizer P inputs by county (A), percentage of county area that was planted in crops (B), animal manure P inputs (C), and netP inputs (D) for the Mississippi River basin from 1997 to 2006.

      Image courtesy Mark David

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