In recent years atmospheric sulfur deposition has been dramatically reduced due to reductions in power plant sulfur emissions. In 2000 it was estimated that Michigan received 8 to 11 lb of sulfur per acre from the atmosphere. By 2010 it was reduced to estimates of only 4 to 5 lb and in 2016 estimates were less than 1 lb of sulfur per acre from atmospheric deposition. The lack of atmospheric deposition has also reduced soil test levels of sulfur. Based on soil test data from B&M Crop Consulting most soil test levels are half the ppm they were in 2005. Many soils now have less than 10 ppm of sulfur. Despite the reductions in deposition and soil test levels, the need for sulfur in a soybean plant has increased as yields have increased. Soybeans remove about 0.20 lb of sulfur per bushel produced. Therefore 60 bushels soybeans remove about 12 lb per acre of sulfur. Removal has far exceeded deposition, which has also led to reduced soil test levels and a potential deficiency in the plant. Sulfur fertilizer may now be needed for soybeans to make up the difference and increase soybean yields. Some plots in Indiana by Purdue University have shown some positive response on average; but no trials have looked at the response across management zones in a field.