The purpose of this study is to evaluate different nitrogen rates, applied to multiple populations, to determine the Economic Optimum Nitrogen Rate (EONR) and Economic Optimum Seeding Rate (EOSR). The goal of this study is to see if nitrogen rates need to increase as populations increase.

2020 Central Illinois Corn Population Study - Nitrogen Rate Response

PFR data over the past three years has illustrated that 190 units of nitrogen in a corn-after-soybean rotation has consistently provided the highest ROI, regardless of the population or hybrid nitrogen efficiency rating.

3-YEAR POPULATION - NITROGEN RESPONSE NET RETURN

Pre: 15 oz. Verdict®, 1 qt. Roundup PowerMAX®, 1 qt. Atrazine Post: 3 oz. Laudis®, 3.2 oz. Zidua®, 1 qt. Roundup PowerMAX® | 

 Various | Soil Type Chenoa Silty (Clay Loam) | 

2021 Iowa Corn Thin Stand Management Study - Fungicide Response

2021 Iowa Corn Sulfur Rate & Timing Study

Population Study

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