Adjusting corn nitrogen management by including a mineralizable‐nitrogen test with the preplant and presidedress nitrate tests

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 2020-05-06T14:49:46.000
dc.date.accessioned 2020-06-29T23:06:52Z
dc.date.available 2020-06-29T23:06:52Z
dc.date.issued 2020-01-01
dc.description.abstract <p>The anaerobic potentially mineralizable N (PMN) test combined with the preplant (PPNT) and presidedress (PSNT) nitrate tests may improve corn (<em>Zea mays</em> L.) N fertilization predictions. Forty‐nine corn N response experiments (mostly corn following soybean [<em>Glycine max</em> (L.) Merr.]) were conducted in the U.S. Midwest from 2014–2016 to evaluate the ability of the PPNT and PSNT to predict corn relative yield (RY) and N fertilizer over‐ and under‐application rates when adjusted by PMN. Before planting and N fertilization, PPNT (0–30, 30–60, and 60–90 cm) and PMN (0–30 cm) samples were obtained. In‐season soil samples were obtained at the V5 development stage for PSNT (0–30, 30–60 cm) in all N rate treatments and PMN (0–30 cm) in only the 0 and 180 kg N ha−1 preplant N treatments. Increasing NO3–N sampling depths beyond 30 cm with or without PMN improved RY predictability marginally (R2 increase up to 0.20) and reduced over‐ and under‐application frequencies up to 14%. Including PMN (preplant only) with PPNT or PSNT improved RY predictability minimally (R2 increase up to 0.10) only for coarse‐ and medium‐textured soils, but N fertilizer over‐ and under‐application frequencies were not substantially reduced (≤12%). These marginal improvements in RY predictability and N fertilizer over‐ and under‐application frequencies, regardless of the variables used (e.g., fertilization, sampling depth, soil texture, and growing degree‐day categories), demonstrate that including PMN with soil NO3–N alone does not improve corn N fertilization need predictions enough to recommend their use.</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. "Adjusting corn nitrogen management by including a mineralizable‐nitrogen test with the preplant and presidedress nitrate tests." <em>Agronomy Journal </em>(2020). doi: <a href="https://doi.org/10.1002/agj2.20228">10.1002/agj2.20228</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/652/
dc.identifier.articleid 1701
dc.identifier.contextkey 17648535
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/652
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/5026
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/652/2020_Sawyer_AdjustingCorn.pdf|||Sat Jan 15 01:24:10 UTC 2022
dc.source.uri 10.1002/agj2.20228
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agriculture
dc.subject.disciplines Soil Science
dc.title Adjusting corn nitrogen management by including a mineralizable‐nitrogen test with the preplant and presidedress nitrate tests
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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