Raising continuous soybean [Glycine max L. (Merr.)] is not very common in Wisconsin. No statistics are kept on the percent acreage of rotated soybean, but a good estimate is that at least 95% of the soybean crop is grown in rotation with some other crop. However, some producers are giving strong consideration to planting soybean after soybean this year. Several reasons include lower input costs compared to corn (Zea mays L.) and an expected increasing demand. A key consideration is that the yield penalty for continuous soybean is too great in most areas to consider continuous cropping. This is often related to the benefit of the rotation effect such as the negative effect associated with the buildup of plant pathogens. This research project determined the rotation effect on corn and soybean and its interaction with tillage system and row spacing. Additionally, visual rating of brown stem rot (Phialophora gregata) severity was conducted in 2000. Only soybean data is presented.