To evaluate the yield and profitability of applying various forms of nitrogen (N) to soybeans at various growth stages.

2016 Southern Illinois Soybean Nitrogen Timing Study

At other PFR locations where we have multi-year data on this study, we have observed a pattern. Supplemental N applications have the most impact on yield in environments with extended periods of saturated soil conditions.

We started the year extremely wet, which delayed planting until May 24. From that point forward, rainfall was more normal and soil conditions were ideal for N fixation.

Between N fixation and soil mineralization, enough N was available to produce the yield levels we experienced while the addition of supplemental N provided no value.

Burndown: 1 qt. Gramoxone® SL 2.0 Pre: 8 oz. Authority® Assist, 1 qt. Roundup PowerMAX® Post: 1 qt. Liberty®, 4 oz. Anthem® Maxx, 4 oz. Section® Three | 

2021 Iowa Soybean SINGULATION STUDY 15 IN. ROWS

2021 Iowa Soybean STARTER FERTILIZER STUDY 2X2X2

Nitrogen Timing Study

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