Iowa has never grown a large acreage of barley in proportion to that of oats in spite of the somewhat higher acre value of the barley crop either for feed or for market. The acreage of oats has steadily increased thruout the last 25 years, while that of barley-originally small-has gradually decreased. But as the low acre value of oats has become relatively lower, with the replacement during the past 12 years by motor power of more than one-third of all the horses in cities and on farms, farmers in increasing numbers are becoming interested in crops which may advantageously replace a part of the present large oat acreage. Apparently barley is the most promising one available for this purpose.
Hughes, H. D. and Burnett, L. C., "Barley Growing" (1928). Circular. Paper 109.