PROJECT
TITLE:
Amber
rotational
study
in
Newana
spring
wheat
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
residual
o-f
the
su-Fonyl
urea
herbicide
Amber
in
com
parison
to
Glean
herbicide
residue
-Following
application
to
a
spring
grain
"
crop.
SUMMARY:
Excellent
broadlea-f
weed
control
was
obtained
by
both
-fall
and
spring
applications
of
Amber
(
.11
to
.43
oz
ai/A
}.
Yields
and
height
were
not
affected
significantly
by
the
fall
or
spring
applications
of
Amber.
"
RESEARCH
METHODS:
Herbicides
were
applied
post
emergence
using
a
tractor
mounted
research
type
sprayer.
Plots
were
10
feet
by
12
feet
with
treatments
being
^
replicated
four
times
in
a
randomized
complete
block.
A
spray
volume
of
24.85
gpa
was
applied
using
8002
nozzles
at
32
psi.
Fall
applications
were
made
to
bare
ground
where
test
site
was
to
be
m
located
the
next
spring.
Light
harrowing
was
done
to
prepare
the
seedbed
in
the
spring.
Newana
spring
wheat
was
seeded
April
12,
1988
using
a
research
seeder.
Post
applications
were
made
after
emergence
on
May
11,
1988.
"
Planting
data:
Crop:
Newana
spring
wheat
Seedbed
preparation:
Fall
plow
and
disc,
spring
disc
and
cultivated,
seedbed
preparation
with
brill
ton
packer
Previous
crop:
Spring
barley
„
Planter:
Research
seeder,
double
disc
openers,
6"
spacing
Seeding
depth:
1
1/2
inches
Seeding
rate:
60
lbs/A
Maintenance
sprays:
Hoelon
1.25
lb
ai/A
5/16/88
Surfactant
or
additions:
X-77
included
in
all
treatments,
,25X
v/v
Application
data:
f-t
Application
#1.
Pre-emergence
Date:
10/15/87
Air
temp:
47
F
Soil
temp:
51
F
Rel.
Hum.
40
7.
Wind:
0
Cloud
cover:
cloudy
„
Soil
moisture:
Topsoil
-
fair
subsoil
-
fair-moderate
Application
#2.
Post
emergence
Date:
5/11/88
Air
temp:
64
F
Soil
temp:
59
F
Rel.
Hum.
36%
"
Wind:
0
Cloud
cover:
clear
Soil
moisture:
Topsoil
-
good
Subsoil
-
very
good
Crop
and
weed
stages:
wheat
3-4
leaf
i-t
Wild
oat
(
Avena
fatua
)
1
leaf
Broadleaf
weeds
-
cotyledon
stage
of:
Night
flowering
catchfly
(
Silene
noctiflora
>
Wild
buckwheat
(
Polygonum
convulvulus
)
Henbit
(
Lamium
amplexicauli
>
Chickweed
<
Stellaria
media
)
RESULTS:
In
the
treatment
year
there
were
no
adverse
effects
of
the
applica
tions
of
Amber
in
the
fall
(
pre
plant
to
spring
wheat
)
or
post
emmergence
in
Newana
spring
wheat.
Yield
and
height
were
equal
throughout
the
trial
with
no
significant
differences
between
treatments.
Test
weights
were
significantly
higher
in
two
treatments
when
compared
to
the
check
<,43
02
per
acre
Amber
pre
emergence
and
,14
oz
ai/A
Amber
post
emergence
>,
Weed
control
was
very
good
for
all
treatments.
Table
1.
Agronomic
data
from
the
Amber
Rotational
Study
conducted
in
Newana
spring
wheat
on
the
Northwestern
Agricultural
Research
Center,
Kal-
ispell,
MT.
in
1988.
Date
planted:
April
12,
1988
Date
harvested:
August
15,
1988
Treatment
Appln
1
Rate
oz
ai/A
Yield
Bu/A
Test
Wt
Height
Ib/Bu
(")
7.
NFC
Broadleaf
Control
1/
WB
HB
CW
f-n
Amber
Fall
.11
43.22
61.15
29.30
100.0
95.00
100.0
100.0
Amber
Fall
.14
45.36
61.12
29.15
86.25
82.50
'96.25
90.00
Amber
Fall
.29
47.72
61.58
28.67
100.0
98.75
100.0 100.0
(-»
Amber
Fall
.43
47.74
61.80
28.73
100.0
96.25
100.0
100.0
Glean
Fall
.29
50.62
61.38
29.60
100.0
100.0
100.0
95.00
Amber
Spring
.11
50.51
61.38
30.10
98.75
90.00
95.00
97.50
1^
Amber
Spring
.14
44.73
61.97
29.02
100.0
98.75
100.0
100-0
Amber
Spring
.29
50.98
61.13
30.30
100.0
100.0
100.0
100.0
p-i
Amber
Spring
.43
43.38
61.38
29.42
100.0
100.0
100.0
100.0
Glean
Spring
.29
44.74
60.45
28.35
100.0
98.75
100.0
100.0
Check
46.02
61.13
30.00
.0000
.0000
.0000
.0000
X
L.S.D
C.V.
P-VALUE
46.82
11.39
8.420
.8600
61.22
29.33
89.55
87.27
90,11
89,32
.5300
1.703
7.794
11.06
5.529
5.975
.2997
2.011
3.014
4.387
2.124
5.975
.0025
.3707
.0000
.0000
.0000
.0000
t
X-77
included
in
all
treatments
at
.25%
V/V
Plots
are
10*
X
12'
1/
Broadleaf
weed
scores
made
6/7/88,
Height
notes
8/9/88
NFC
=
Nightflowering
catchfly
(Silene
noctiflora)
WB
=
Wild
buckwheat
(Polygonum
convulvalus)
HB
-
Henbit
(Lamium
amplexicauli)
CW
=
Chickweed
(Stellaria
media)
