Full TGIF Record # 225769
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Web URL(s):http://plantscience.psu.edu/research/projects/vegetative-management/annual-reports/1991-final-report
    Last checked: 12/5/2016
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Author(s):Gover, Arthur E.; Watschke, Thomas L.; Lyman, Gregory T.
Author Affiliation:Gover: Project Associate; Lyman: Former Project Assistant, Agronomy; Watschke: Professor, Turfgrass Science
Title:Effects of addition of UAN to plant growth regulators applied to low maintenance tall fescue turf
Section:1990 results: Roadside vegetation management studies
Other records with the "1990 results: Roadside vegetation management studies" Section
Source:Turfgrass Research Results 1990/1991 [Penn State]. 1991, p. 61-63.
# of Pages:3
Publishing Information:[University Park, Pennsylvania]: [Pennsylvania State University, College of Agriculture, Agronomy Dept., Entomology Dept., Horticulture Dept., Plant Pathology Dept.]
Keywords:TIC Keywords: Discoloration; Festuca arundinacea; Growth regulator evaluation; Nitrogen fertilization; Plant growth regulators; Urea-ammonium nitrate
Abstract/Contents:"Plant growth regulator (PGR) treatments were applied with either 0, 2.5, or 5 gallons/acre of a UAN solution containing 2% nitrogen (0, 7.3, and 1.45 lb N/acre, respectively), to determine if the added nitrogen would have an effect on the discoloration of tall fescue (Festuca arundinacea) often associated with PGR applications. The PGR treatments were mefluidide alone, an in combination with either chlorsulfuron or a premix of imazethapyr and imazapyr, and a check which received UAN treatments only. The study was laid out as a randomized complete block with a split-plot treatment arrangement with three replications. The 3 by 15 ft PGR sub-plots were randomly assigned within each 12 by 15 ft UAN rate whole plot. The treatments were applied April 25, 1990, using a CO2 powered hand held boom delivering 17 GPA at 30 psi using Spraying Systems 8002 flat fan nozzles. The tall fescue was 3 to 5 in, with no observable signs of internode elongation. Each PGR treatment included dicamba at 0.5 lb ai/acre and a non-ionic spray adjuvant at 0.25% (v/v). Visual ratings of percent seedhead suppression compared to the check, turf color, and turf quality were taken June 5, 41 days after treatment (DAT), and July 3 (69 DAT). Turf color and quality were rated on a 0 to 9 scale, with '0' indicating dead turf, '9' indicating an ideal turf, and '5' being the lowest acceptable rating. Ratings results for UAN rates averaged over PGR treatments, PGR treatments averaged over UAN rates, and the UAN rate*PGR treatment interactions are reported in Table 1, 2, and 3 respectively. After the data was subjected to analysis of variance, the only dependent variable exhibiting a significant interaction between UAN rate and PGR treatment effects was turf color rated 41 DAT. This was due to a significant decrease to unacceptable levels in the color rating of mefluidide plus chlorsulfuron at the 5 gallon/acre rate of UAN, while color ratings for other treatments were not affected by UAN rate (Table 3). UAN rate effects were significant for turf color rated 41 DAT, due primarily to the unacceptable rating for mefluidide plus chlorsulfuron at the 5 gal/acre rate. UAN rate effects were almost significant (P=0.097) for turf quality ratings 41 DAT, due to the influence of the poor color ratings for mefluidide plus chlorsulfuron. Seedhead suppression at either rating date, and turf color and turf quality ratings for July 3 were not influenced by UAN rate (Table 1). All three PGR combinations provided excellent seedhead control compared to the UAN-only check at both rating dates (Table 2). All treatments were rated as acceptable for turf color 41 DAT, but there were significant differences. The UAN-only check was significantly better than all other treatments, and mefluidide alone or in combination with the premix of imazethapyr and imazapyr was rated significantly better than mefluidide plus chlorsulfuron. For turf color ratings 69 DAT the UAN-only check was rated as barely acceptable due to leaf senescence. The three PGR treatments were rated significantly better than the check, but there was no significant difference between them. The UAN-only check was rated as unacceptable for turf quality 41 DAT, due to uneven canopy appearance and the presence of seedheads. Mefluidide plus chlorsulfuron was rated significantly lower than mefluidide alone and with the premix of imazethapyr and imazapyr due to greater discoloration. At 69 DAT, the three PGR treatments were rated very similarly, and provided significantly better turf quality than the UAN-only check, which was rated unacceptable due to a ragged appearance from unchecked growth, senescent leaves, and seedheads. Under the conditions of this study, the addition of nitrogen in the form of UAN did not positively affect turf treated with PGR's, and at high rates actually resulted in greater discoloration to turf treated with mefluidide plus chlorsulfuron."
Note:This item is an abstract and tables only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Gover, A. E., T. L. Watschke, and G. T. Lyman. 1991. Effects of addition of UAN to plant growth regulators applied to low maintenance tall fescue turf. Turfgrass Research Results 1990/1991 [Penn State]. p. 61-63.
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    Last checked: 12/5/2016
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    Notes: Item is within a single large file and is an abstract
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