Provenance
Handout by Joy Branlund, Southwestern Illinois College, including a map made with Google Maps, data from Gregory Mullins (2009, Phosphorus, Agriculture and the Environment, Virginia Cooperative Extension, Virginia Tech), Rehm, George W., Schmitt, Michael A., Lamb, John, and Roger Eliason (2012, Fertilizing Soybeans in Minnesota), EPA Storet website (www.epa.gov/storet/) and including a short excerpt from Natural Capitalism: Creating the next industrial revolution, 1999, by Lovins, L. Hunter, and Paul Hawken, ETH-Bibliothek.

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