Protein and oil content of soybeans from different geographic locations

Data on soybean yield, protein content and oil content were provided by three crushing companies. There was a definite trend toward lower protein content in soybeans processed and most likely grown in northern versus southern locations (about 34 to 44 N latitude) in 1986–87 (r=0.77). In 1983–86, protein content was generally lower in soybeans processed in Minnesota than in those processed in Indiana and Illinois. Effects of location on oil content and of year on protein and oil content were less clear. Uniform Soybean Tests data over 11 years and four locations (3 in Minnesota, 1 in Illinois) showed significant effects of year on oil content and of location on yield and oil content, but little effect of either on protein content.