Decreasing fraction of acidified lands in the same ten Corn Belt states over time with EW deployment. The shading denotes 90% confidence limits. A threshold pH value of 6.5 is used as this is beneficial for most arable crops and serves as a reasonable middle ground for safeguarding yields. Only a small fraction of grid cells will have an average pH value close to the 6.5 boundary value each year, resulting in a narrow confidence interval range.
