PROJECT
TITLEt
Evaluation
oi
bromoxynil
in
combination
with
sulfonyl
urea
herbicides
on
spring
wheat.
YEAR/PROJECTJ
1988/754
PROJECT
PERSONNEL:
Leader
-
Vern
R.
Stewart,
Todd
K.
Keener
-
Research
^
Specialist.
Northwestern
Agricultural
Reseach
Center,
Kalispell,
NT.
OBJECTIVE:
...
^
Efficacy
and
crop
injury
evaluation
o-f
bromoxynil
in
combination
with
suHonyl
urea
herbicides
on
spring
wheat.
SUMMARY:
.
_
^
^
Yield
and
test
weights
were
not
significantly
different
when
comparing
treatment
combinations
of
bromoxynil
with
Harmony
Extra
or
Express.
Broadleaf
weed
control
was
excellent
for
all
species
(
except
henbit
)
for
all
treat-
"
ments.
RESEARCH
METHODS:
Herbicides
were
applied
post
emergence
using
a
tractor
mounted
research
type
sprayer.
Plots
were
10
teet
by
12
feet
with
treatments
being
replicated
■four
tiroes
in
a
randomized
complete
block
design.
Plots
were
seeded
with
a
12
foot
drill,
in
strips,
and
spray
applications
were
made
perpendicular
to
the
"
strip.
A
spray
volume
of
24.85
gpa
was
applied
using
8002
nozzles
at
32
psz.
Planting
data:
Crop:
Newana
spring
wheat
Seedbed
preparation:
Fall
plow
and
disc,
spring
disc
and
cultivate,
Seedbed
completed
with
brill
ion
packer
^
Previous
crop:
Spring
barley
Type
of
planting:
Press
type
drill,
7"
spacing
Seeding
depth:
1
1/2
inches
Seeding
rate:
60
lbs/A
"
Maintenance
sprays:
Hoelon
at
.75
lb
ai/A
on
May
20,
Surfactant
or
additions:
R-11
used
at
.25X
v/v
where
indicated
m
Application
data:
Date:
5/25/88
Air
temp:
64
F
Soil
temp:
60
F
Rel.
Hum.
30
7.
Wind:
0
Cloud
cover:
clear
^
Boil
moisture:
Topsoil
-
fair
subsoil
~
very
good
Crop
and
weed
stages
at
applications:
Crop:
3-5
leaf,
pre-tiller
n
4.
11
Lambsquarter
(
Chenpodium
album
)
6-8
leaves,
2
1/2
"
tall
Henbit
(
Lamium
amp1exicauli
>
4-6
leaves
Pigweed
(
Amaranthus
retroflexus
)
4
leaves
.
4.
11
Night
flowering
catchfly
(
Silene
noctiflora
)
4
leaves,
1-2
tall
Fanweed
(
Thlaspi
arvense
>
6-10
leaves,
2"
tall
Wild
buckwheat
(
Polygonum
convolvulus
)
2
leaves,
1-2"
tall
RESULTS:
Yield
and
test
weights
were
not
significantly
different
when
comparing
treatments
of
brorooxynil
alone
or
in
combinations
with
Harmony
Extra
or
Express,
Excluding
the
check,
broadleaf
weed
control
was
above
907.
for
all
weeds
except
henbit.
Henbit
was
not
effectively
controlled
using
bromoxynil,
bromoxynil
+
liCPA,
2,4-D,
and
Harmony
Extra
+
bromoxynil
(
at
the
low
rate
).
Table
1.
Agronomic
data
from
a
broadleaf
weed
control
study
in
spring
wheat
grown
on
the
Northwestern
Agricultural
Research
Center,
Kalispell,
MT.
in
1988.
Planted:
April
11,
1988
Date
harvested:
August
23,
1988
Treatment
Rate
YLD
T.W.
Percent
Weed
Control
1/
lb
ai/A
Bu/A
Ib/B
LQ
PW
NFC
HB
FW
Express
+
Surf.
(.25'/.
v/v)
.016
88.1
61.1
100.0
98.75
100.0
98.75
100.0
Harmony
Extra
+
Surf,
.016
87.5
61.4
98.75
100.0
100.0
90.00
100.0
Buctril
.375
89.0
60.8
100.0
98.75
100.0
67.50
100.0
Bronate
.375
86.2
61.1
93.75
100.0
92.50
77.50
100.0
Express
+Buctril
+Surf.
.008+.187
84.1
61.4
98.75
100.0
100.0
98.50
100.0
Express+Buctril+Surf.
.016+.187
91.9
60.9
100.0
100.0
100.0
99.25
100.0
Harmony
Extra
+
Surf.
.008+.187
81.4
61.1
100.0
100.0
100.0
79.75
100.0
+Buctril
Harmony
Extra
+
Surf.
.016+.187
78.6
61.2
100.0
100.0
100.0
93.50
100.0
+Buctril
2,4-D
.5
87.7
61.1
100.0
100.0
100.0
48.50
100.0
Check
—
77.5
61.1
.0000
.0000
.0000
.0000.0000
SUMMARY
STATISTICS:
OVERALL
MEAN
85.2
61.1
89.13
89.75
89.25
75.32
90.00
CV
(SE/MEAN)
6.52
.245
2.339
.6343
2.109
14.96
.0000
LSD(
0.05
)
16.1
.434
6.049
1.652
5.461
32.71
.0000
P-VALUE
.698
.197
.0000
.0000
.0000
.0000
.0000
n
Plots
10'
X
12'
1.
Ocular
estimates
of
weed
control,
ratings
taken
6/24/88
LQ
=
Lambsquarter
(Chenopodium
album)
PW
=
Pigweed
(Amaranthus
retroflexus)
NFC
=
Night
flowering
catchfly
(Silene
noctiflora)
MB
Henbit
(Lamium
amplexicauli)
FW
=
Fan
weed
(Thlaspi
arvense)
