AGRICULTURE: A Good Rotation Crop

In his light blue sedan, husky William Gehring, 46, was moseying along the sand-rutted roads of northwestern Indiana. The air had a sharp but pleasant smell. Farmer Gehring sniffed it with proprietorial fondness, watched an echelon of his big tractors cut across the black muck and sandy loam. Trucks, loaded high with sweet-smelling green leaves, carried them to workers who dumped them into giant vats, then jumped up & down on them.

Farmer Gehring, the biggest U.S. grower of mint, last week was in the midst of harvesting his highly profitable crop. From his 2,500 acres of spearmint and peppermint he...

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