u.s._map_showing_nitrogen.png

Figure 10. An estimated 5.5 million metric tons of nitrogen fertilizer were applied to croplands in the Mississippi River Basin during 1991.
Originally uploaded in Integrate:Teaching for Sustainability:InTeGrate Modules:Water Science and Society:Student Materials.

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Source: From Goolsby and Pereira, 1995; USGS Circular 1133
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