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Le Mars Field, Iowa

A farmer in Le Mars, Iowa, empties corn from a combine on his family farm. By fertilizing heavily, this farmer was able to raise enough corn on 140 acres (57 hectares) to fatten more than 700 hogs and 100 head of cattle.

(Text adapted from and photograph shot on assignment for, but not published in, "The Revolution in American Agriculture," February 1970, National Geographic magazine)

Photograph by James P. Blair