Fig. 4.
Type of land cover (%) at 0.5, 1.0, 1.5, and 2.0 km from the center of all soybean fields in 2006 (A), 2007 (B), and 2008 (C).

Type of land cover (%) at 0.5, 1.0, 1.5, and 2.0 km from the center of all soybean fields in 2006 (A), 2007 (B), and 2008 (C).

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