{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/46614"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/46614","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Within-row spacing effect on individual corn plant yield","abstract":"Past research has shown that modest non-uniformity of corn plant spacing has small, negative effects on grain yield. The extent to which this influence of distance to adjoining plants is due to compensatory yield adjustments is not known. In 2011 and 2012, high density stands in 76 cm rows were hand thinned to 74 130 plants ha-1 during early vegetative growth (V1-V2) to produce large variability in plant-to-plant, with-in row spacing. Individual ears were hand-harvested at physiological maturity after recording the distance of each plant to its nearest within-row neighbors. In 2011, there was no significant correlation between each plant’s individual space in the row and grain weight per plant (r = 0.0007 p = 0.60). In contrast, in 2012 there was a significant correlation (r = 0.12 p < 0.0001), and per-plant grain weight increased 2.5 g for each additional cm of space along the row. Plant spacing affected neither kernel weight nor kernel number per ear in 2011, but in 2012, kernel weight increased (by 2 mg) and kernel number (by 2.96 kernels per ear) for each additional cm of space occupied by a plant. The average per-plant grain yield was only slightly higher in 2011 (185 g) than in 2012 (180 g), but the pattern of weather was very different, with dry conditions late in 2011 and very dry conditions until after pollination in 2012, followed by late rainfall that helped grain fill. Thus while reducing variability of interplant spacing would seem to offer little benefit under good growing conditions, doing so under certain stress conditions might provide a yield benefit.","abstract_html":"Past research has shown that modest non-uniformity of corn plant spacing has small, negative effects on grain yield. The extent to which this influence of distance to adjoining plants is due to compensatory yield adjustments is not known. In 2011 and 2012, high density stands in 76 cm rows were hand thinned to 74 130 plants ha-1 during early vegetative growth (V1-V2) to produce large variability in plant-to-plant, with-in row spacing. Individual ears were hand-harvested at physiological maturity after recording the distance of each plant to its nearest within-row neighbors. In 2011, there was no significant correlation between each plant’s individual space in the row and grain weight per plant (r = 0.0007 p = 0.60). In contrast, in 2012 there was a significant correlation (r = 0.12 p &lt; 0.0001), and per-plant grain weight increased 2.5 g for each additional cm of space along the row. Plant spacing affected neither kernel weight nor kernel number per ear in 2011, but in 2012, kernel weight increased (by 2 mg) and kernel number (by 2.96 kernels per ear) for each additional cm of space occupied by a plant. The average per-plant grain yield was only slightly higher in 2011 (185 g) than in 2012 (180 g), but the pattern of weather was very different, with dry conditions late in 2011 and very dry conditions until after pollination in 2012, followed by late rainfall that helped grain fill. Thus while reducing variability of interplant spacing would seem to offer little benefit under good growing conditions, doing so under certain stress conditions might provide a yield benefit.","abstract_has_math":false,"creators":["Thompson, Tyler"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Crop Sciences","degree_department":null,"school":null,"contributors":["Nafziger, Emerson D."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-01-16T17:56:14Z","date_published":"2014-01-16T17:56:14Z","updated_at":"2026-07-22T22:25:36Z","subjects":["Corn","Crop production","Within-row spacing","Planting","Spacing Variation","Kernel Weight","Kernel Number"],"languages":["en"],"rights":["Copyright 2013 Tyler Thompson"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/46614","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Nafziger, Emerson D."]},{"key":"dc:creator","label":"Author","values":["Thompson, Tyler"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-01-16T17:56:14Z","2013-12"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Crop Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Corn","Crop production","Within-row spacing","Planting","Spacing Variation","Kernel Weight","Kernel Number"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2013 Tyler Thompson"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/46614"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Past research has shown that modest non-uniformity of corn plant spacing has small, negative effects on grain yield. The extent to which this influence of distance to adjoining plants is due to compensatory yield adjustments is not known. In 2011 and 2012, high density stands in 76 cm rows were hand thinned to 74 130 plants ha-1 during early vegetative growth (V1-V2) to produce large variability in plant-to-plant, with-in row spacing. Individual ears were hand-harvested at physiological maturity after recording the distance of each plant to its nearest within-row neighbors. In 2011, there was no significant correlation between each plant’s individual space in the row and grain weight per plant (r = 0.0007 p = 0.60). In contrast, in 2012 there was a significant correlation (r = 0.12 p < 0.0001), and per-plant grain weight increased 2.5 g for each additional cm of space along the row. Plant spacing affected neither kernel weight nor kernel number per ear in 2011, but in 2012, kernel weight increased (by 2 mg) and kernel number (by 2.96 kernels per ear) for each additional cm of space occupied by a plant. The average per-plant grain yield was only slightly higher in 2011 (185 g) than in 2012 (180 g), but the pattern of weather was very different, with dry conditions late in 2011 and very dry conditions until after pollination in 2012, followed by late rainfall that helped grain fill. Thus while reducing variability of interplant spacing would seem to offer little benefit under good growing conditions, doing so under certain stress conditions might provide a yield benefit.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2013-12-09T16:00:18Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 4 Final Thesis Draft Revised.docx: 285584 bytes, checksum: da8ca5d7aee27bd17875976febaa0fe7 (MD5) Variable Plant Spacing 2012.xlsx: 300400 bytes, checksum: aa2f7a2997a3e61e95316c52d2ffe370 (MD5) Variable Plant Spacing 2011.xlsx: 286701 bytes, checksum: c4cf1f80adb2551e21ab8cc888957051 (MD5) Thompson_Tyler.pdf: 932529 bytes, checksum: 0137039df8473b9f61a23a31f678f013 (MD5)","Made available in DSpace on 2014-01-16T17:56:14Z (GMT). No. of bitstreams: 5 Tyler_Thompson.pdf: 932529 bytes, checksum: 0137039df8473b9f61a23a31f678f013 (MD5) Variable Plant Spacing 2012.xlsx: 300400 bytes, checksum: aa2f7a2997a3e61e95316c52d2ffe370 (MD5) Variable Plant Spacing 2011.xlsx: 286701 bytes, checksum: c4cf1f80adb2551e21ab8cc888957051 (MD5) Final Thesis Draft Revised.docx: 285584 bytes, checksum: da8ca5d7aee27bd17875976febaa0fe7 (MD5) license.txt: 4063 bytes, checksum: b0ec62ffd0b79accf04b06bda1924a43 (MD5)"]},{"key":"dc:title","label":"Title","values":["Within-row spacing effect on individual corn plant yield"]}]}],"canonical_facts":{"dc:contributor":["Nafziger, Emerson D."],"dc:creator":["Thompson, Tyler"],"dc:date":["2014-01-16T17:56:14Z","2013-12"],"dc:description":["Past research has shown that modest non-uniformity of corn plant spacing has small, negative effects on grain yield. The extent to which this influence of distance to adjoining plants is due to compensatory yield adjustments is not known. In 2011 and 2012, high density stands in 76 cm rows were hand thinned to 74 130 plants ha-1 during early vegetative growth (V1-V2) to produce large variability in plant-to-plant, with-in row spacing. Individual ears were hand-harvested at physiological maturity after recording the distance of each plant to its nearest within-row neighbors. In 2011, there was no significant correlation between each plant’s individual space in the row and grain weight per plant (r = 0.0007 p = 0.60). In contrast, in 2012 there was a significant correlation (r = 0.12 p < 0.0001), and per-plant grain weight increased 2.5 g for each additional cm of space along the row. Plant spacing affected neither kernel weight nor kernel number per ear in 2011, but in 2012, kernel weight increased (by 2 mg) and kernel number (by 2.96 kernels per ear) for each additional cm of space occupied by a plant. The average per-plant grain yield was only slightly higher in 2011 (185 g) than in 2012 (180 g), but the pattern of weather was very different, with dry conditions late in 2011 and very dry conditions until after pollination in 2012, followed by late rainfall that helped grain fill. Thus while reducing variability of interplant spacing would seem to offer little benefit under good growing conditions, doing so under certain stress conditions might provide a yield benefit.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2013-12-09T16:00:18Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 4 Final Thesis Draft Revised.docx: 285584 bytes, checksum: da8ca5d7aee27bd17875976febaa0fe7 (MD5) Variable Plant Spacing 2012.xlsx: 300400 bytes, checksum: aa2f7a2997a3e61e95316c52d2ffe370 (MD5) Variable Plant Spacing 2011.xlsx: 286701 bytes, checksum: c4cf1f80adb2551e21ab8cc888957051 (MD5) Thompson_Tyler.pdf: 932529 bytes, checksum: 0137039df8473b9f61a23a31f678f013 (MD5)","Made available in DSpace on 2014-01-16T17:56:14Z (GMT). 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