Corn Yield Response to Row Spacing and Plant Population in Iowa

dc.contributor.author Licht, Mark
dc.contributor.author Parvej, M. R.
dc.contributor.author Licht, Mark
dc.contributor.author Wright, Emily
dc.contributor.department Agronomy
dc.date 2020-01-29T21:26:18.000
dc.date.accessioned 2020-06-29T23:06:41Z
dc.date.available 2020-06-29T23:06:41Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2019
dc.date.issued 2019-11-01
dc.description.abstract <p>Corn (<em>Zea mays</em> L.) planted in narrow row spacing (<30-inch) with high plant population has become a recent interest in the US Corn Belt to increase grain yield. We evaluated the impact of row spacing and plant population on corn grain yield across 22 site-years in Iowa from 2009 to 2018. Experiments were designed as a split-plot with two row spacings, 20- and 30-inch, as the main-plot and three to four plant populations, ranging from 30,000 to 42,000 plants acre<sup>–1</sup>, as subplot. Grain yield was affected in 73% of the site-years: 13 site-years by row spacing, six site-years by plant population, and 2 site-years by the interaction of both. Corn in 20-inch rows yielded 5 to 19 bu acre<sup>–1</sup> more in 11 site-years and 10 to 14 bu acre<sup>–1</sup> less in two site-years compared to 30-inch rows. In both 20- and 30-inch row spacings, corn yield decreased linearly at 0.4 to 1.7 bu acre<sup>–1</sup> per thousand increase in plant population in four site-years and responded quadratically with peak yield at around 36,000 plants acre<sup>–1</sup> in two site-years. However, corn yield increased linearly at 2.0 to 3.1 bu acre<sup>–1</sup> per thousand increase in plant population only when planted in 20-inch row in two site-years. When all 22 site-years were combined, yield was only affected by row spacing. Corn in 20-inch rows produced similar yield under low yielding environments and 8 to 10 bu acre<sup>–1</sup> more yield under high yielding environments compared to 30-inch row spacing. Results suggest that farmers should move to 20-inch row spacing at yield levels greater than 235 bu acre<sup>–1</sup>.</p>
dc.description.comments <p>This article is published as Licht, M.A., M.R. Parvej, and E.E. Wright. 2019. Corn Yield Response to Row Spacing and Plant Population in Iowa. <em>Crop, Forage & Turfgrass Management</em> 5:190032. doi: <a href="http://dx.doi.org/10.2134/cftm2019.05.0032" target="_blank">10.2134/cftm2019.05.0032</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/628/
dc.identifier.articleid 1675
dc.identifier.contextkey 16373771
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/628
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/5000
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/628/2019_Licht_CornYield.pdf|||Sat Jan 15 01:19:25 UTC 2022
dc.source.uri 10.2134/cftm2019.05.0032
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Statistical Models
dc.title Corn Yield Response to Row Spacing and Plant Population in Iowa
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 94d77752-004d-4791-a18a-a0c91c281f4c
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
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