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Title:Plant growth regulators and biostimulants for use in varying management systems to improve corn grain yield
Author(s):Sible, Connor Nelson
Advisor(s):Below, Fred E.
Contributor(s):Martin, Nicolas Federico; Butts-Wilmsmeyer, Carolyn
Department / Program:Crop Sciences
Discipline:Crop Sciences
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:M.S.
Genre:Thesis
Subject(s):PGR
Biostimulant
Corn
Abstract:Plant growth regulators (PGRs) and biostimulants are product chemistries that have recently become popular in the agricultural market. There is no concrete evidence however, for their best place in a management system to optimize their return on investment and crop yield potential. The objective of this study was to evaluate the responses of corn (Zea mays L.) grain yield to in-furrow and foliar applications of PGRs and biostimulants, and to determine if PGRs and biostimulants impact yield differently under varying management systems. Field studies were conducted in the 2017 and 2018 growing seasons across three locations: Harrisburg, Champaign, and Yorkville in Illinois. Corn was grown under two different management conditions, a standard or an intensive input system. The standard management was implemented with a standard planting population, fertility based on soil test values, and with no foliar fungicide. The intensive input system used an increased plant population, added fertility through nitrogen side-dress and foliar micro fertilizer applications, and provided a fungicide application at the VT growth stage. The PGRs (Ascend SL or Optify/Stretch) were applied in-furrow at planting, and either Ascend SL, or a biostimulant (Toggle or Voyagro) was applied to the foliage at the V5 growth stage. Corn plants grown in the intensive input system out-yielded those grown in the standard system by 1 kilogram hectacre-1 (15 bushels acre-1) on average, showing that grain yield can be increased through management. Plant growth regulators and biostimulant applications resulted in few significant impacts on yield and yield components, with responses being both positive and negative. Therefore, PGRs and biostimulants can influence corn grain yield, but these responses vary and their effects were greatest when applied in an intensive input system.
Issue Date:2019-04-22
Type:Text
URI:http://hdl.handle.net/2142/104895
Rights Information:Copyright 2019 Connor Sible
Date Available in IDEALS:2019-08-23
Date Deposited:2019-05


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