Several studies were conducted in Wisconsin in 2010 to evaluate the efficacy of relatively high rates of gypsum, specifically FGD gypsum collected from coal burning power plants. None of the studies demonstrated substantial yield effects, and those that showed response may be due to S addition. Soil physical properties were not affected, in general, by FGD application, but there was evidence at one site that penetration resistance was reduced at depth where either FGD or commercial gypsum was applied at a high rate. This may be due to changes in soil water properties that would affect the resistance measured by the probe. The most interesting response measured in 2010 was that for dissolved reactive P from the surface of soils treated with high rates of gypsum. Preliminary data show that the DRP was reduced where 1 to 2 ton/acre of FGD gypsum was applied to the surface post-planting. While these data are promising no recommen- dation for FGD gypsum can be made beyond its proven benefit as a calcium and sulfur source for plants.