Soil‐nitrogen, potentially mineralizable‐nitrogen, and field condition information marginally improves corn nitrogen management

dc.contributor.author Clark, Jason
dc.contributor.author Fernández, Fabián
dc.contributor.author Sawyer, John
dc.contributor.author Veum, Kristen
dc.contributor.author Camberato, James
dc.contributor.author Carter, Paul
dc.contributor.author Ferguson, Richard
dc.contributor.author Franzen, David
dc.contributor.author Kaiser, Daniel
dc.contributor.author Kitchen, Newell
dc.contributor.author Laboski, Carrie
dc.contributor.author Nafziger, Emerson
dc.contributor.author Rosen, Carl
dc.contributor.author Sawyer, John
dc.contributor.author Shanahan, John
dc.contributor.department Agronomy
dc.date 2020-08-19T18:48:29.000
dc.date.accessioned 2021-02-24T19:25:12Z
dc.date.available 2021-02-24T19:25:12Z
dc.date.issued 2020-01-01
dc.description.abstract <p>Anaerobic potentially mineralizable nitrogen (PMN) combined with preplant nitrate test (PPNT) or pre‐sidedress nitrate test (PSNT) may improve corn (<em>Zea mays</em> L.) N management. Forty‐nine corn N response studies were conducted across the U.S. Midwest to evaluate the capacity of PPNT and PSNT to predict grain yield, N uptake, and economic optimal N rate (EONR) when adjusted by soil sampling depth, soil texture, temperature, PMN, and initial NH4–N from PMN analysis. Pre‐plant soil samples were obtained for PPNT (0‐ to 30‐, 30‐ to 60‐, 60‐ to 90‐cm depths) and PMN (0‐ to 30‐cm depth) before corn planting and N fertilization. In‐season soil samples were obtained at the V5 corn development stage for PSNT (0‐ to 30‐, 30‐ to 60‐cm depths) at 0 kg N ha−1 at‐planting rate and for PMN when 0 and 180 kg N ha−1 was applied at planting. Grain yield, N uptake, and EONR were best predicted when separating soils by texture or sites by annual growing degree‐days and including PMN and initial NH4–N with either NO3–N test. Using PSNT (mean <em>R2</em> = .30)‐instead of PPNT (mean <em>R2</em> = .19)‐based models normally increased predictability of corn agronomic variables by a mean of 11%. Including PMN and initial NH4–N with PPNT or PSNT only marginally improved predictability of grain yield, N uptake, and EONR (<em>R2</em> increase ≤ .33; mean <em>R2</em> = .35). Therefore, including PMN with PPNT or PSNT is not suggested as a tool to improve N fertilizer management in the U.S. Midwest.</p>
dc.description.comments <p>This article is published as Clark, Jason D., Fabián G. Fernández, Kristen S. Veum, James J. Camberato, Paul R. Carter, Richard B. Ferguson, David W. Franzen et al. "Soil‐nitrogen, potentially mineralizable‐nitrogen, and field condition information marginally improves corn nitrogen management." <em>Agronomy Journal </em>(2020). doi: <a href="https://doi.org/10.1002/agj2.20335">10.1002/agj2.20335</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/670/
dc.identifier.articleid 1719
dc.identifier.contextkey 19013408
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/670
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/93069
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/670/2020_Sawyer_SoilNitrogen.pdf|||Sat Jan 15 01:27:25 UTC 2022
dc.source.uri 10.1002/agj2.20335
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Soil Science
dc.title Soil‐nitrogen, potentially mineralizable‐nitrogen, and field condition information marginally improves corn nitrogen management
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 17ce8a78-56b3-47be-abcb-b22968be40f2
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
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