We can profitably use commercial fertilizer for oats on many Iowa farms. That is the conclusion we have reached from tests made by the Iowa Agricultural Experiment Station in the past 2 years. In 1944 and 1945 we had over 30 field experiments with about 1,500 small plots. These were scattered over most of Iowa’s major soil areas.
Nelson, L. B.; Meldrum, H. R.; and Lawton, Kirk
"Fertilize The Oat Crop!,"
Farm Science Reporter: Vol. 7
, Article 2.
Available at: http://lib.dr.iastate.edu/farmsciencereporter/vol7/iss1/2