Can I apply less nitrogen with the addition of Sulfur?

Multiple sites tested the addition of Thio-Sul® with UAN at V6. While the addition of Thio-Sul® with these UAN applications increased yields at the end of the season, the yield increase of +1.3 Bu./A. with 153 units UAN + 5 gal. Thio-Sul® and +0.8 Bu./A. with 133 units UAN + 5 gal. Thio-Sul®. While yield was gained, this yield increase was not enough to result in a positive return on investment.

The purpose of this study is to evaluate the use of Thio-Sul® in a sidedress application at the V6 growth stage, in an attempt to increase nitrogen use efficiency, plant health, yield and profitability.

A reduction in sulfur (S) emissions, coupled with increased demand from higher corn yields, has made S deficiencies more common in recent years. Because organic matter is the primary source of S in most soils and due to sulfate sulfur’s vulnerability to loss via leaching, S deficiencies are most common in lighter, sandier soils. Multi-location data this year showed little advantage to supplemental S, which also appears to have had no effect on nitrogen use efficiency. We believe these results would have been different in locations with a sandy soil composition.

2021 Iowa Corn Thin Stand Management Study - Fungicide Response

2021 Iowa Corn Sulfur Rate & Timing Study

Sulfur Study

2017 Multi-location Corn Sulfur Study

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