The purpose of the Iowa Corn Yield Test is to find for each section of the state those strains of corn which will produce the largest yields of sound grain. Significant differences in yield between strains grown in test field under as nearly as possible the same conditions may be attributed to differences inherent in the strains.
This publication is a progress report bowing the comparative yields obtained in 1929 and the percentage yields for a period of year
Robinson, Joe L. and Bryan, A. A., "Iowa Corn Yield Test, Results for 1929" (1929). Iowa Corn Yield Tests. 10.