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Information about the Mississippi River Delta's potential for expanding cropland is essential before policy decisions can be made that will effectively increase food supplies. A cost/productivity submodel derives a ratio of the costs of converting land to the productivity of the converted land and estimates the quantity of noncropland available for conversion. Cost/benefit ratios of soil-productivity groups and crop rotation make it possible to develop a data base for new-cropland supply in the seven-county sample for 1985. 8 references. (DCK)

Estimating a Potential Cropland Supply Function for the Mississippi Delta Region