PROJECT
TITLE:
Stage
o-F
growth
and
application
rate
evaluation
o-F
tralkoxydim
(
PP604
)
-For
the
control
of
wild
oats
in
Gal
latin
spring
barley.
YEAR/PROJECT:
1988/754
PROJECT
PERSONNEL:
Leader
-
Vern
R.
Stewart,
Todd
K.
Keener
-
Research
Specialist.
Northwestern
Agricultural
Reseach
Center,
Kali
spell,
MT.
OBJECTIVE;
To
determine
the
effectiveness
of
tralkoxydim
(
PP
604
)
for
control
of
wild
oats
in
spring
barley.
SUMMARY:
Testing
two
rates
of
tralkoxydim
at
two
levels
of
crop
oil
concentrate
(
C.O.C.)
at
three
application
stages
(
1-3
leaf,
3-5
leaf,
tillering
of
wild
oats
)
on
spring
barley
the
3-5
leaf
application
stage
and
the
6
oz
ai/A
rate
with
2'/.
crop
oil
concentrate
treatment
was
the
most
effective.
RESEARCH
METHODS:
Herbicides
were
applied
post
emergence
at
the
1-3
leaf,
3-5
leaf,
and
tillering
stage
of
wild
oats
using
a
tractor
mounted
research
type
sprayer.
Plots
were
10
feet
by
12
feet.
Treatments
were
replicated
four
times
in
a
randomized
complete
block.
A
spray
volume
of
24.85
gpa
was
applied
using
8002
nozzles
at
32
psi.
Two
rates
of
tralkoxydim
(
4
and
6
oz
ai/A
)
were
used
at
two
levels
of
crop
oil
concentrate
(
1
and
27.
C.O.C.
).
Planting
data:
Crop:
Gallatin
spring
barley
Seedbed
preparation:
Fall
plow
and
disc,
spring
disc
and
cultivate,
^
seedbed
completed
with
a
brillion
packer
Previous
crop:
Spring
barley
;
Planter:
Press
type
drill,
7"
spacing
Seeding
depth:
1
1/2
inches
Seeding
rate:
60
lbs/A
^
Maintenance
sprays:
Bromoxynil
at
.375
lb
ai/A,
5/20/88
Surfactant
or
additions:
See
treatment
plan,
AL
411F
used
as
C.O.C.
Application
data:
1-3
leaf
stage
Date;
5/16/88
Air
temp:
70
F
Soil
temp:
70
F
Rei.
Hum.
15
7.
Wind;
0-3,S
Cloud
cover:
clear
Soil
moisture:
Topsoil
-
good
subsoil
-
very
good
Crop
and
weed
stages
at
applications:
Barley:
3
leaf
Wild
oats
(
Avena
fatua
)
157.
1
If,
80%
2
If,
5%
3
If
Broadleaf
weeds
-
cotyledon
stages
Application
data:
3-5
leaf
stage
Date:
5/25/88
Air
temp:
53
F
Soil
temp:
50
F
Rel.
Hum.
42
7.
Wind:
0-2
mph
Cloud
cover:
clear
Soil
moisture:
Topsoil
-
moist
subsoil
-
very
good
^r/
Crop
and
weed
stages
at
applications:
Barley:
5
lea-f
Wild
oats:
57.
2
H,
807.
3
lea-f,
207.
4
H,
57.
5
U
Application
data:
Tillering
stage
Date:
6/2/88
Air
temp:
50
F
Soil
temp:
46
F
Rel.
Hum.
44
7.
Wind:
0-2
mph
Cloud
cover:
clear
Soil
moisture:
Topsoil
-
very
moist
subsoil
-
very
good
Crop
and
weed
stages
at
applications:
Barley:
6"
tall,
tillered,
plants
wet
at
appln.
Wild
oats:
5
lea-f,
tillered
RESULTS:
The
higher
rate
of
tralkoxydim
(
6
oz.
ai/A
)
at
each
growth
stage
resulted
in
higher
yields,
test
weights,
percent
plumps
and
wild
oat
control.
No
significant
differences
were
noted
when
crop
oil
concentrate
percentages
were
varied
with
the
same
rate.
The
applications
of
tralkoxydim
made
at
the
1
to
3,
and
3
to
5
leaf
stage
of
growth
gave
95
to
99%
control
of
wild
oats,
with
the
1
to
3
leaf
stage
being
the
highest.
Tralkoxydim
applications
at
the
last
two
stages
of
growth
resulted
in
plant
height
reduction
of
barley.
Although
excellent
wild
oat
control
was
seen in
the
last
two
-application
stages,
it
appears
that
at
the
3
to
5
leaf
stage
of
the
grain
there
was
less
injury
than
the
tillering
stage
and
resulted
in
higher
yields,
test
weights
and
stands.
See
table
1.
Table
1.
Agronomic
data
-from
the
Tralkoxydim
<
PP
604
)
Rate
and
Stage
of
Growth
Study
grown
on
the
Northwestern
Agricultural
Research
Center,
Kalispell,
Ml.
R-13
Date
planted:
April
11,
1988
Harvested:
August
15,
1988
Treatment
Rate
Growth
Yield
T.W.
7.
#
W.O.
7.
W.Oat
Control
%
NT
oz
ai/A
Stage
Bu/A
#/Bu
Pip
/ft2
7/7
7/19
Stand
(")
m
PP
604
+
17.
COC
4
1-3
If
41.4
50.3
82.5
29.5
31.3
5.0
100
33.4
PP
604
+
17.
COC
6
1-3
If
56.8
51.1
89.4
29.0
56.3
27.5
100
30.8
PP
604
+
27.
COC
4
1-3
If
47.0
50.6
86.8
28.8
42.5
2.5
100
31.5
r-f
PP
604
+
2%
COC
6
1-3
If
56.1
51.3
89.7
18.8
58.7
23.8
100
31.3
Check
1-3
If
26.5
50.4
86.0
34.8
.000
0
100
34.1
S.
0.
G.
MEAN
1/
45.6
50.7
86.9
28.2
37.8
11.8
100
32.2
r?
PP
604
+
17.
COC
4
3-5
If
78.7
52.2
94.2
.8
98.7
98.0
96.5
27.3
PP
604
+
17.
COC
6
3-5
If
80.1
52.1
94.3
.5
99.7
99.3
94.3
27.3
r?
PP
604
+
27.
COC
4
3-5
If
77.8
52.6
94.8
.8
99.5
99.0
96.3
28.4
PP
604
+
27.
COC
6
3-5
If
78.8
52.3
95.6
.5
99.7
99.3
91.3
27.3
Check
3-5
If
24.6
49.0
84.4
23.8
.000
0
100
33.0
pn
S.O.G.
MEAN
1/
68.0
51.6
92.7
5.3
79.6
79.1
95.7
28.6
PP
604
+
17.
COC
4
Tiller
55.7
51.492.6
3.8
91.3
95.0
81.8
26.5
PI
PP
604
+
17.
COC
6
Ti11er
60.3
51.4
94.1
1.0
98.8
97.3
88.8
26.0
PP
604
+
27.
COC
4
Tiller
51.2
51.0
92.7
4.0
95.0
94.0
82.5
25.8
PP
604
+
27.
COC
6
Tiller
60.6
51.5
92.6
2.8
97.8
97.3
87.0
26.0
ti
Check
—
25.1
49.4
80.8
29.0
.000
0
100
34.8
S.O.G.
MEAN
1/
50.6
50.9
90.6
8.1
76.5
76.7
88.0
27.8
ALL
TRTMT
X
55.0
51.1
90.0
13.8
64.6
55.9
94.5
29.5
LSD
11.2
.99
2.75
6.9
8.33
8.29
5.24
2.36
C.V.
7.15
.68
1.07
17.4
4.58
5.20
1.94
2.80
P-VALUE
.000
.000
.000
.000
.000
.000
.000
.000
1/
S.C
I.G
1.
MEAN
=
Mean
for
5
treatments
within
respective
stage
of
growth
