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Long-Term Impact of Nitrogen Fertilization on Corn Production, Soils and Nitrogen Cycling Processes in Minnesota

Study Author(s): Jeffrey Vetsch, Melissa Wilson, Fabián Fernández, Karina Fabrizzi, Daniel Kaiser, Yuxin Miao, Paulo Pagliari, Lindsay Pease, Carl Rosen, Albert Sims, Jeffrey Strock
Years of study: 2019 – 2022
Location(s): Crookston MN, Morris MN, Becker MN, Lamberton MN, Waseca MN, Rochester MN.

Important: for the complete report, including all tables and figures, please download using the links to the right.

Read Full 2019 Report
Read Full 2021 Report
Read Full 2022 Report
Read Full 2023 Report


During the 2022 growing season, there was no significant interaction between N rate and N source for corn grain yield at any site, except at Crookston (Tables 3, 5, 7). There was a positive response to N application for both CC and CSb cropping systems at all locations but no differences due to N source (Table 3, 5, 7). The lack of difference due to N source likely reflects the fact that after fertilizer applications the potential for N loss was low due to the generally low precipitation. The persistent dry conditions this season likely reduced corn grain yields except at the irrigated site (Becker). In addition, at Crookston grain yield was reduced by a pathogen (Goss’Wilt).

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