The use of high-quality seed of recommended varieties is an important part of good farming- and adds little to cost. These recommended varieties are based on years of tesing and research.
Johnson, I. J. and Bragonier, W. H.
"Crop Varieties for 1958,"
Iowa Farm Science: Vol. 12
, Article 6.
Available at: https://lib.dr.iastate.edu/farmscience/vol12/iss7/6