Iowa has sprung into soybean production so fast that farmers still have many questions about the crop even though they grew 2 1/4 million acres last year. But despite their questions, they have learned a great deal, for they are now getting average yields of close to 21 bushels an acre as compared with less than 15 a few years ago.
Hughes, H. D. and Weber, C. R.
"What About Soybeans in 1943?,"
Farm Science Reporter: Vol. 4
, Article 2.
Available at: http://lib.dr.iastate.edu/farmsciencereporter/vol4/iss1/2