Nitrogen Application Study 

2018 Iowa Corn Nitrogen Application Study

  • Iowa

The purpose of this study is to compare various nitrogen (N) application equipment options at V5 sidedress and their effects on N uptake, yield, and profitability.





Beck’s PFR has had success testing 360 Y-DROP® applications at multiple sites for multiple years. However, in 2018, the traditional sidedress application out-yielded the 360 Y-DROP system at the Iowa PFR site. We speculate that the weather and placement was critical this year for nitrogen (N) applications. Because our application window occurred during a period of hot, dry weather, we believe there was more volatilization with the 360 Y-DROP application vs. the soil-applied coulter bar. More volatilization would result in more N loss and thus, less availability during the later window of rapid uptake. This is supported by the results of the individual hybrids tested. We saw a greater yield loss with XL® 5765AM™*brand, which is known to be a heavier N feeder in comparison to BECK 5829A4brand.



Planted 4/27/2018 | Harvested 9/12/2018 | Population 34,000 Seeds/A. | Row Width 30 in. | Previous Crop Soybeans | Tillage Fall: Strip-Till, Spring: No-Till | Herbicides Pre: 3.5 oz. Corvus®, 1 qt. Atrazine Post: 3 oz. Capreno®, 1 qt. Atrazine | Insecticides Escalate® | Starter 8.5 gal. 32-0-0 2x2 | Total Nitrogen 190 units as UAN | Soil Type Judson (Silt Loam) | Soil Test Values pH 6.4, O.M. % 3.6, CEC 12.4 | Percent Base Saturation Ca 64.3, Mg 22.4, K 3.6, H 9.7 | Parts Per Million P 36, K 173, S 7, Zn 3.8, Mn 60, B 0.2



360 Y-DROP®


*®XL, Optimum, and AcreMax are registered trademarks of Pioneer. XL® brand seed is distributed by Beck’s Superior Hybrids, Inc.