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Weed control and crop
tolerance to herbicides in no-till dry pea (Minot 2004).
Majoret dry pea was
direct-seeded April 26 into wheat stubble at 120 lb/A into 7.5-inch rows.
Individual plots were 10 x 30 ft and replicated three times. Preemergence (PRE)
and postemergence (POST) herbicides were applied May 4 and June 17,
respectively. The study was conducted on a loam soil with pH 5.5 and OM 3.1%.
The primary weeds present were green and yellow foxtail (Fxtl), redroot pigweed
(Rrpw), and wild buckwheat (wibw).
None of the treatments
reduced crop density compared to the untreated check. However, Sencor applied
PRE and treatments containing Basagran caused slight to moderate visible crop
injury at the July rating. Yield with Basagran alone was slightly lower, which
was likely due to moderate crop injury and slightly lower broadleaf weed control
compared to other treatments.
All treatments provided
good to excellent control of redroot pigweed and wild buckwheat. Spartan at the
low rate (2.67 oz) and Basagran alone provided slightly less control of redroot
pigweed and wild buckwheat compared to other treatments. Spartan alone did not
control the foxtail species. Select and Poast provided good foxtail control.
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|
|
|
Dry pea |
Yield |
TW |
Fxtl |
Rrpw |
Wibw |
|
Treatmenta |
Rate |
Timing |
Jun 3 |
Jul 10 |
Aug 13 |
Jun 14 |
Jul 10 |
Jun 14 |
Jul 10 |
Jun 14 |
Jul 10 |
|
|
|
|
#/m row |
% inj |
lb/A |
lb/bu |
% control |
|
Raptorb + Basagran |
4 oz + 1 pt |
POST |
8.7 |
13 |
2796 |
64.8 |
0 |
94 |
0 |
92 |
0 |
90 |
|
Spartan/
Select + COC |
2.67 oz/
5 fl oz + 1%
v/v |
PRE/
POST |
9.5 |
1 |
3100 |
65.6 |
60 |
95 |
76 |
83 |
77 |
88 |
|
Spartan/
Select + COC |
4 oz/
5 fl oz + 1%
v/v |
PRE/
POST |
8.9 |
2 |
2850 |
64.6 |
71 |
97 |
90 |
91 |
87 |
95 |
|
Spartan/
Select + COC |
5.33 oz/
5 fl oz + 1%
v/v |
PRE/
POST |
9.4 |
0 |
3119 |
64.7 |
73 |
97 |
90 |
90 |
93 |
96 |
|
Basagran +
Poast + COC |
2 pt +
1 pt + 2 pt |
POST |
8.7 |
17 |
2606 |
65.0 |
0 |
89 |
0 |
86 |
0 |
85 |
|
Spartan/
Basagran +
Poast + COC |
2.67 oz/
1 pt +
1 pt + 2 pt |
PRE/
POST |
8.9 |
14 |
2926 |
65.7 |
58 |
93 |
73 |
93 |
77 |
95 |
|
Spartan + Sencor/
Select + COC |
4 oz + 0.33 lb/
5 fl oz + 1%
v/v |
PRE/
POST |
8.4 |
21 |
2906 |
65.7 |
67 |
97 |
88 |
94 |
87 |
92 |
|
Untreated |
|
|
9.0 |
0 |
2190 |
64.6 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Handweeded checkc |
|
|
8.3 |
7 |
2846 |
65.1 |
0 |
0 |
0 |
0 |
0 |
0 |
|
LSD (0.05) |
|
|
NS |
5 |
346 |
NS |
16 |
3 |
20 |
9 |
18 |
5 |
|
CV |
|
|
8.3 |
33 |
7 |
0.8 |
25 |
2 |
25 |
8 |
22 |
4 |
aRoundup
UltraMax II plus AMS was applied PRE to each treatment at 11 oz + 2.5
gal/100gal.
bRaptor was
applied with NIS and 28% N at 0.25% v/v + 1 qt.
CSelect plus COC
at 5 oz + 1% v/v were applied to aid handweeding.
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