Ammonium nitrate is the preferred N source under these conditions. The timing of the spring application of N can be quite important. Recent research at Auburn University has shown that mid-February appears to be the optimum time to make this N application. Too much N may increase the incidence of smuts and certain foliar diseases. Each of these elements is important in wheat production.
Needs vary from field to field.
Base the fertilization needs of these elements on a soil test. Other Nutrients Available magnesium is routinely determined on soil samples received by the Auburn University Soil Testing Laboratory. When magnesium is low and liming is needed, dolomitic lime is recommended. Calcium is also supplied by lime and is generally not deficient in areas where there is a suitable soil pH. Sulfur may be deficient in soils where little or no sulfur has been applied recently. An application of 10 pounds per acre of sulfur each year is suggested to prevent sulfur deficiencies.