Development of soybean varieties tolerant to low iron availability in calcareous soils has been an acceptable solution to the problem. Soil pH is to be used to determine whether or not to lime the soil. Salix soil associations, soil pH 6.0 is considered sufficient for corn and soybean grown in these soil associations, but when liming is required, lime is recommended to raise soil pH to 6.5. The amount of limestone recommended is adjusted for the depth of tillage, which determines the volume of soil to be neutralized. The depth for no-till is considered to be 2 to 3 inch depth unless specified otherwise.
B designates the Mississippi bottomland.