摘要：In areas where all farmland is generally incrop in each production year, expandingcrop rotations is accomplished bysubstituting acreage of an alternative cropfor some acreage of an existing crop. Inareas where summer fallow is included inthe rotation, expanding crop rotations canoccur through substitution of alternativecrop acreage for some acreage of anexisting crop or increasing farmland useintensity by planting an alternative cropon land that would have otherwise beenfallowed.
