{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/34483"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/34483","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Response of cool-season turfgrass to foliar applied and stabilized nitrogen fertilizers","abstract":"The objective of my work was to determine factors that affect uptake of N by cool-season turfgrasses. Experiments were conducted to determine the quantity of foliar-applied N that is absorbed by turfgrass leaves, ways to optimize the process, and whether other common management practices can affect foliar N uptake under field conditions. Studies were also carried out to determine if foliar-applied N results in greater N use efficiency than traditional soil-applied methods, as well to determine whether foliar-applied ammoniacal N sources lead to enhanced turf performance under energy stress. A further objective was to assess whether stabilized N fertilizers offered a benefit over unamended sources under field conditions. Experiments to address these objectives were carried out at the Landscape Horticulture Research Center in Urbana, IL. The results indicate that approximately 7-34% of foliar-applied N is absorbed by turfgrass within 4-6 h post application, that this uptake is not affected by common management practices, and that the main driver of foliar N uptake is spray volume, with lower spray volumes enhancing foliar uptake. Furthermore, foliar applications proved far superior to traditional soil-based applications of N fertilizer in terms of N use efficiency. No convincing evidence was obtained that foliar applications of ammoniacal N moderate energy stress when turfgrass is cultivated on a highly fertile native soil. Finally, stabilized N fertilizers were found to offer no benefit over unamended N sources to highly maintained turfgrass cultivated under field conditions.","abstract_html":"The objective of my work was to determine factors that affect uptake of N by cool-season turfgrasses. Experiments were conducted to determine the quantity of foliar-applied N that is absorbed by turfgrass leaves, ways to optimize the process, and whether other common management practices can affect foliar N uptake under field conditions. Studies were also carried out to determine if foliar-applied N results in greater N use efficiency than traditional soil-applied methods, as well to determine whether foliar-applied ammoniacal N sources lead to enhanced turf performance under energy stress. A further objective was to assess whether stabilized N fertilizers offered a benefit over unamended sources under field conditions. Experiments to address these objectives were carried out at the Landscape Horticulture Research Center in Urbana, IL. The results indicate that approximately 7-34% of foliar-applied N is absorbed by turfgrass within 4-6 h post application, that this uptake is not affected by common management practices, and that the main driver of foliar N uptake is spray volume, with lower spray volumes enhancing foliar uptake. Furthermore, foliar applications proved far superior to traditional soil-based applications of N fertilizer in terms of N use efficiency. No convincing evidence was obtained that foliar applications of ammoniacal N moderate energy stress when turfgrass is cultivated on a highly fertile native soil. Finally, stabilized N fertilizers were found to offer no benefit over unamended N sources to highly maintained turfgrass cultivated under field conditions.","abstract_has_math":false,"creators":["Henning, Shelby"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Natural Res & Env Sciences","degree_department":null,"school":null,"contributors":["Branham, Bruce E.","Briskin, Donald P.","Mulvaney, Richard L.","Voigt, Thomas B."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-09-18T21:19:18Z","date_published":"2012-09-18T21:19:18Z","updated_at":"2026-07-22T22:25:31Z","subjects":["cool-season","urea","Nitrogen-15 (15N)","turfgrass","Nitrogen fertilization","foliar","stabilized","creeping bentgrass"],"languages":["en"],"rights":["Copyright 2012 Shelby W. 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A further objective was to assess whether stabilized N fertilizers offered a benefit over unamended sources under field conditions. Experiments to address these objectives were carried out at the Landscape Horticulture Research Center in Urbana, IL. The results indicate that approximately 7-34% of foliar-applied N is absorbed by turfgrass within 4-6 h post application, that this uptake is not affected by common management practices, and that the main driver of foliar N uptake is spray volume, with lower spray volumes enhancing foliar uptake. Furthermore, foliar applications proved far superior to traditional soil-based applications of N fertilizer in terms of N use efficiency. No convincing evidence was obtained that foliar applications of ammoniacal N moderate energy stress when turfgrass is cultivated on a highly fertile native soil. Finally, stabilized N fertilizers were found to offer no benefit over unamended N sources to highly maintained turfgrass cultivated under field conditions.","Item withdrawn by Alexis Thompson (athmpsn1@illinois.edu) on 2012-07-10T20:40:10Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Henning_Shelby.pdf: 843806 bytes, checksum: 451f2fda54a7ec5b54f1a72c259a4779 (MD5)","Made available in DSpace on 2012-09-18T21:19:18Z (GMT). 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Experiments were conducted to determine the quantity of foliar-applied N that is absorbed by turfgrass leaves, ways to optimize the process, and whether other common management practices can affect foliar N uptake under field conditions. Studies were also carried out to determine if foliar-applied N results in greater N use efficiency than traditional soil-applied methods, as well to determine whether foliar-applied ammoniacal N sources lead to enhanced turf performance under energy stress. A further objective was to assess whether stabilized N fertilizers offered a benefit over unamended sources under field conditions. Experiments to address these objectives were carried out at the Landscape Horticulture Research Center in Urbana, IL. The results indicate that approximately 7-34% of foliar-applied N is absorbed by turfgrass within 4-6 h post application, that this uptake is not affected by common management practices, and that the main driver of foliar N uptake is spray volume, with lower spray volumes enhancing foliar uptake. Furthermore, foliar applications proved far superior to traditional soil-based applications of N fertilizer in terms of N use efficiency. No convincing evidence was obtained that foliar applications of ammoniacal N moderate energy stress when turfgrass is cultivated on a highly fertile native soil. Finally, stabilized N fertilizers were found to offer no benefit over unamended N sources to highly maintained turfgrass cultivated under field conditions.","Item withdrawn by Alexis Thompson (athmpsn1@illinois.edu) on 2012-07-10T20:40:10Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Henning_Shelby.pdf: 843806 bytes, checksum: 451f2fda54a7ec5b54f1a72c259a4779 (MD5)","Made available in DSpace on 2012-09-18T21:19:18Z (GMT). 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Henning"],"dc:subject":["cool-season","urea","Nitrogen-15 (15N)","turfgrass","Nitrogen fertilization","foliar","stabilized","creeping bentgrass"],"dc:title":["Response of cool-season turfgrass to foliar applied and stabilized nitrogen fertilizers"],"thesis:degree_discipline":["Natural Res & Env Sciences"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:31Z"}