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Title: Response of cool-season turfgrass to foliar applied and stabilized nitrogen fertilizers
Author(s): Henning, Shelby
Director of Research: Branham, Bruce E.
Doctoral Committee Chair(s): Branham, Bruce E.
Doctoral Committee Member(s): Briskin, Donald P.; Mulvaney, Richard L.; Voigt, Thomas B.
Department / Program: Natural Res & Env Sci
Discipline: Natural Res & Env Sciences
Degree Granting Institution: University of Illinois at Urbana-Champaign
Degree: Ph.D.
Genre: Dissertation
Subject(s): 15N
turfgrass
Nitrogen fertilization
foliar
stabilized
creeping bentgrass
cool-season
urea
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.
Issue Date: 2012-09-18
URI: http://hdl.handle.net/2142/34483
Rights Information: Copyright 2012 Shelby W. Henning
Date Available in IDEALS: 2012-09-18
Date Deposited: 2012-08


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