A single soybean variety can express a wide range of grain protein and oil content when exposed to different environmental conditions. Information about the impact of manageable factors on the protein and oil content of soybeans grain is scarce at best.

Eight thousand eight hundred and forty nine soybean grain samples from 72 experiments were analyzed for protein and oil content at the University of Wisconsin in Madison. The two main objectives were (1) to identify management practices that can have an impact on soybean grain composition, and (2) to demonstrate the extent to which some management variables can impact the protein and oil content of soybean grain.