An empirical model accurately estimates row crop and extensive crop acreage in the North Central region. It shows (a) for each 1-acre increase in diversion, rcw crops decrease 0.62 acre and extensive crops decrease 0.12 acre, and (b) the annual shift to .row crops is diminishing.

This research completes a series of estimates of supply relationships for corn, sorghum, oats, and barley. (See M. E. Ryan and M. E. Abel, "Corn Acreage Response .. .,"Agr. Econ. Res. 24(4); 102-112, Oct. 1972, and "Supply Response of U.S. Sorghum Acreage ...,"Agr. Econ. Res. 25(2); 45-55, April...

This paper modifies and employs a model previously developed for empirical evaluation of the impact of commodity price-support programs on corn acreage. (See J. P. Houck and M. E. Ryan, "Supply Analysis for Corn in the United States ... ," Amer. Jour. Agr. Econ. 54: May 1972; and J. P. Houck and A....