While the University of Wisconsin-Extension guidelines for nitrogen applications to sweet corn are listed at 150 lb/ac of N for soils with less than 2% SOM and 130 lb/ac of N for soils with 2 to 10% SOM, there are still many questions related to other N management practices (such as timing and source). A change in N timing relative to planting date is a key factor in improving N use efficiency for sweet corn on irrigated sandy soil. Two studies have been conducted over the past 3 years to evaluate if there are any benefits to altering the timing and rate of N applications on sweet corn.
Soil Science Extension
University of Wisconsin Madison