Modern crop production methods call for a combination of many factors to maximize farm returns. One of the important decisions you make each year is the choice of crops and varieties that best fit into your total farming operation. And this choice may depend on many factors.
Johnson, I. J. and Bragonier, W. H.
"Crop Varieties for 1959,"
Iowa Farm Science: Vol. 13
, Article 5.
Available at: https://lib.dr.iastate.edu/farmscience/vol13/iss7/5