Form Approved
REPORT DOCUMENTATION PAGE
OMB No. 0704-0188
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1. AGENCY USE ONLY (Leave blank)
2. REPORT DATE
3. REPORT TYPE AND DATES COVERED
September 1996
4. TITLE AND SUBTITLE
5. FUNDING NUMBERS
Plant Growth Regulators' Effect on Growth of Mixed Cool-Season
Grass Stands at Fort Drum
6. AUTHORS
Antonio J. Palazzo, Paul Zang, Robert W. Duell,
Timothy J. Cary and Susan E. Hardy
7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)
8. PERFORMING ORGANIZATION
REPORT NUMBER
U.S. Army Cold Regions Research and Engineering Laboratory
72 Lyme Road
Special Report 96-24
Hanover, New Hampshire 03755-1290
9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)
10. SPONSORING/MONITORING
AGENCY REPORT NUMBER
Environmental Division
Headquarters
85 First Street West
U.S. Army Forces Command
Fort Drum, New York 13062-5097
Fort McPherson, Georgia 30330-6000
11. SUPPLEMENTARY NOTES
For conversion of SI units to non-SI units of measurement consult ASTM Standard E380-93, Standard Practice for Use of the
International System of Units, published by the American Society for Testing and Materials, 1916 Race St., Philadelphia, Pa.
19103.
12a. DISTRIBUTION/AVAILABILITY STATEMENT
12b. DISTRIBUTION CODE
Approved for public release; distribution is unlimited.
Available from NTIS, Springfield, Virginia 22161
13. ABSTRACT (Maximum 200 words)
Mowing is one of the more expensive operations in managing roadside and other low-maintenance turfgrass
areas. The objective of this study was to evaluate the performance of two plant growth regulators (PGRs)--
mefluidide (Embark) and imidazolinone (Event)--in reducing the development of seedheads and inhibiting the
vertical growth (plant height) of mixed turf swards at multiple sites over a two-year period. Mefluidide applied
at the manufacturer's recommended rate (2.3 L/ha or 2 pints/acre) provided the best general control of plant
height and seedhead development compared to mefluidide at lower rates or imidazolinone at both recom-
mended and lower rates or a combination of mefluidide and imidazolinone at lower rates. Within the control
areas (no PGR), plant height did not correlate with plant weight. Therefore, the timing of treatments is critical
since increases in plant height and weight occur at different times during the spring. At the early May application
time, mefluidide applied at the recommended rate inhibited both plant height and weight. The effects of this
treatment on plant growth were similar in most of the eight sites tested. However, PGR performance was
affected by the presence of earlier maturing grasses in the sward, microclimatic factors, and broadleaf weeds.
There was no difference in the effectiveness of the treatments when the materials were applied again during the
following season. Despite some variation in its effect, the mefluidide treatment at the recommended rate was
consistent enough among all test locations, turf species, and microclimates to recommend using this technique in
the demonstration stage of the trial.
14. SUBJECT TERMS
15. NUMBER OF PAGES
17
Cold regions
Plant growth regulators
Turfgrasses
16. PRICE CODE
17. SECURITY CLASSIFICATION
18. SECURITY CLASSIFICATION
19. SECURITY CLASSIFICATION
20. LIMITATION OF ABSTRACT
OF REPORT
OF THIS PAGE
OF ABSTRACT
UNCLASSIFIED
UNCLASSIFIED
UNCLASSIFIED
UL
Standard Form 298 (Rev. 2-89)
NSN 7540-01-280-5500
Prescribed by ANSI Std. Z39-18
298-102
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