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( r- Agricultural Research & Education (ediMVE LIBRARY
-/, IFAS, University of Florida
S Bradenton, Florida APR 02 182
Bradenton AREC Research Report GC1982-4 February, 1982
I.F.A.S. Univ. of Flonrda
GRASS GROWTH REGULATOR STUDY --
J. P. Gilreath
Conversations with industry personnel indicated Eptar 10G (EPTC) demonstrated
growth regulating properties on grasses in experiments in the spring of 1981 in
Florida. A replicated study was conducted to determine if Eptan, formulated as a
10% granule, would reduce the growth and seed stalk development of common bahiagrass.
The test area was mnowed to a height of 3 inches on August 13, 1981. Treatments
of 5 and 8 lb. active ingredient per acre with and without 0.5 inches of water
applied just after treatment application were applied on August 15, 1961.
Information on the experimental methods and conditions is given in Table 1.
Results and Discussion
Doth Eptam rates significantly reduced grass height after % days, but had no
significant effect on either grass height or number of seed stalks produced after
15 and 22 days (Table 2). There were no significant differences in growth among
the Eptar treatments in the first week. The addition of water after application
of Eptam 10G did not affect results.
Lack of significance in grass height in the second and third weeks may be
associated with having 2 replicates. An increase in the number of replicates
would increase the sensitivity of the test.
Table 1. Experimental methods s and conditions.
EXPERIHENT Grass Growth ,ecgulator Study
SEASON Surler YEAR 19m1
LOCATIO0 Bradenton, FL
VARIETY Bahiagrass ROU UIDTH i~/A
PLOT SIZE 16 x 15 feet PLANT SPACING/SEEDjIG RATE N/A
DATE NOWED 13 August 19C1 SOIL TYPE AND pii Unknown; plH 6.9
:XPEiFiEilTAIL DESIGC Cormletely random design REPS 2
APPLICATION TIiLE WEATHER
Type & Date 15 August 19U~ Sky Conditions Clear
Time of Day 2:00 PM Air Temperature 9GOF
EQUIPMET Hd Soil Temperature 870F
EQUIPMET Hand Relative Humidity 70%
Nozzle Tips N/A Winc Calm
Volunle N/A Soil Hoisture 50% f.c.
Pressure ii/A Rainfall after
Speed N/A application 0
COMMENTS: Eptam 10G was mixed with sand to facilitate even application.
15 August 1981 Applied O.b in. of water by overhead sprinkler
immediately after application
Table 2. Effect of Eptam 10G on growth and seed stalk development of bahiagrass.
Bradenton, FL 1981.
Rate Irrigation Grass height (in.) Stalk production
Treatment (lb. a.i./A) (in.) Au. 23 Aug. 30 Sept. 7 (number/sq. ft.)
Check .5az 10.3 11.9 2.7
Eptam 8 0.5 6.9b 8.5 8.4 2.8
Eptam 8 0 G.9b 9.2 9.8 2.3
Eptam 5 0.5 6.9b u.8 9.1 2.0
Eptam 5 0 7.3b 9.5 10.0 2.8
ZNean separation within columr~is by Duncan's r.)nw multiple range test, 5% level (lower
case) or nonsignificant (no letters).