Full TGIF Record # 225853
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Author(s):Gover, Arthur E.; Watschke, Thomas L.; Batey, David A.
Author Affiliation:Gover: Project Associate; Batey: Research Technologist, Agronomy; Kuhns: Professor, Ornamental Horticulture
Title:Effects of adjuvants on PGR activity on tall fescue
Section:1991 results: Roadside vegetation management studies
Other records with the "1991 results: Roadside vegetation management studies" Section
Source:Turfgrass Research Results 1990/1991 [Penn State]. 1991, p. 134-136.
# of Pages:3
Publishing Information:[University Park, Pennsylvania]: [Pennsylvania State University, College of Agriculture, Agronomy Dept., Entomology Dept., Horticulture Dept., Plant Pathology Dept.]
Abstract/Contents:"As part of a cooperative research project with the Pennsylvania Department of Transportation, an experiment designed to evaluate the effects of spray adjuvants on the activity of plant growth regulators (PGR's) was established May 3, 1991, at the Landscape Management Research Center, University Park, PA. Two PGR treatments, each sprayed with five different adjuvant treatments, were applied to unmowed 'Kentucky 31' tall fescue (Festuca arundinacea) using CO2 powered hand-held sprayer delivering 17 GPA at 30 psi, using Spraying Systems 8002 flat fan spray tips. All PGR treatments included 0.5 lb ae/acre of dicamba. Individual plots were 6 by 15 ft, arranged in a randomized complete block design with a split-plot treatment arrangement, with PGR treatment as the whole plot effect, and spray adjuvant as the sub-plot effect. The tall fescue was 3 to 8 in tall, and the apex of the inflorescence was up to 1 in from the base of the crown. The two PGR treatments were mefluidide at 0.38 lb ai/acre, and mefluidide plus chlorsulfuron at 0.19 plus 0.012 lb ai/acre. The adjuvant treatments were none, X-77, Clean Cut, HyGrade Plus, and Cidekick II. Adjuvants were applied at the rate of 0.25% v/v. Visual ratings of turf color and turf quality were taken May 21. On June 5, canopy height was estimated by measuring the height at which 1 ft diameter, 0.25 in thick particle-board disk was suspended after being dropped from a height of 3 ft. Clipping yields were taken June 13 on a dry weight basis, and July 16 on a fresh weight basis, with a rear-bag 20 in wide rotary mower set at a 3.5 in mowing height. The plots were not irrigated prior to June 13, and showed considerable drought stress. The plots were mowed at 3.5 in, then irrigated for three weeks with 0.75 in water/week prior to the July 16 clipping collection. All PGR treatments provided excellent seedhead control. There was a significant interaction between PGR treatment and adjuvant for turf color on May 21 (Table 1). turf color in plots treated with mefluidide alone was not significantly different from the untreated check, and was not affected by the adjuvant. All plots treated with mefluidide plus chlorsulfuron were rated significantly lower than the untreated check for turf color, and plots treated with Clean-Cut were rated significantly lower than those treated with Cidekick II. The effect of PGR treatment was not significant for any dependent variable. Adjuvant effects were significant for turf color, turf quality, and canopy height (Table 2). The untreated check was rated significantly higher for turf color than all treated plots. There was no significant difference in turf quality between the treated plots, and all treated plots had better turf quality than the untreated check, which had abundant seedheads and an uneven canopy due to unchecked growth. There was no significant difference in canopy height among the treated plots, and all treated plots were significantly shorter than the untreated check. The untreated check had the highest clipping yields on June 13, and there are no significant differences in clipping yield on July 16."
Note:This item is an abstract and table only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Gover, A. E., T. L. Watschke, and D. A. Batey. 1991. Effects of adjuvants on PGR activity on tall fescue. Turfgrass Research Results 1990/1991 [Penn State]. p. 134-136.
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