Full TGIF Record # 225842
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Author(s):Clark, J. M.; Hamilton, G. W. Jr.; Watschke, T. L.
Author Affiliation:Clark, Research Technologist; Hamilton: Supervisor, Agronomy; Watschke: Professor, Turfgrass Science
Title:Turfgrass response to several plant growth regulators
Section:1991 results: Weed control in turfgrass
Other records with the "1991 results: Weed control in turfgrass" Section
Source:Turfgrass Research Results 1990/1991 [Penn State]. 1991, p. 95-101.
# of Pages:7
Publishing Information:[University Park, Pennsylvania]: [Pennsylvania State University, College of Agriculture, Agronomy Dept., Entomology Dept., Horticulture Dept., Plant Pathology Dept.]
Abstract/Contents:"An experiment was conducted to evaluate the effects of several plant growth regulators on vertical height and clipping yields. The study was conducted on a mixed stand of cool-season grasses at the Landscape Management Research Center of the Pennsylvania State University, University Park, PA. Treatments included CGA-163935, mefluiide, flurprimidol, and an untreated check. Plot size was 3' x 10' arranged in a split-plot completely randomized block design, with three replications. Treatments were applied with a CO2 powered backpack sprayer delivering 40 GPA at 30 PSI through two 6504 flat fan nozzles on July 12, 1991. Whole treatment plots were split into mowed and unmowed sections. Two height measurements were taken from each section, approximately once a week. When the average of the two heights in the mowed region reached 6.5 cm it was mowed to 5.5 cm with a 51 cm rear-bagging rotary mower. Clippings were collected and weighed. The data was subjected to an split plot analysis of variance procedure and in order to examine sub unit differences the data was reevaluated using a completely randomized block analysis of variance procedure. All mean separation was accomplished using Fisher's protected LSD. Within mowed plots, height, individual clipping yield, and total clipping yield were determined. In unmowed plots only the height was measured. Turf treated with CGA-163935 and mefluidide had significantly lower average heights than the untreated check on three dates and flurprimidol was lower on one date (Table 1). There were four dates on which the mowed plots were significantly lower than the unmowed plots (Table 2). On July 29 and August 17, there were significant differences in height for mowed plots. Turf treated with CGA-163935 was usually significantly lower than the treated check, and lower than flurprimidol on one date. Also, turf treated with mefluidide was significantly lower than the untreated check on one date (Table 3, Figure 1). The sum of all clipping yields over the duration of the experiment revealed no significant differences (Table 4, Figure 2). Comparing clipping yields on individual dates showed that they were only significantly different on August 17 (Table 5). Heights of unmowed plots were significantly different on three dates (July 29, August 1, and August 17). CGA163935 (0.36 lbs ai/acre) and mefluidide were significantly lower than the untreated check on all three dates, and on August 1 and August 17 they were lower than flurprimidol (Table 6, Figure 3). Clipping accumulation throughout the experiment is given in (Table 7, Figure 4)."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Clark, J. M., G. W. Jr. Hamilton, and T. L. Watschke. 1991. Turfgrass response to several plant growth regulators. Turfgrass Research Results 1990/1991 [Penn State]. p. 95-101.
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