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Fall-applied Spartan in
chickpea (2003)
B-90 chickpeas were seeded
April 24 into 7.5-inch rows at 180 lb/A. Individual plots were 10 x 30 ft and
replicated three times. Fall, PRE, and POST treatments were applied November
19, April 24, and June 2, respectively. The primary weeds evaluated were kochia
(Kocz), redroot pigweed (Rrpw), and wild buckwheat (Wibw).
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|
|
|
Kocz |
Rrpw |
Wibw |
Yield |
Test Wt |
|
Treatmenta |
Rate |
Timing |
Jun 7 |
Jun 17 |
Jul
7 |
Jun 7 |
Jun 17 |
Jul
7 |
Jun 7 |
Jun 17 |
Aug 21 |
|
|
|
|
———————% control ——————— |
lb/A |
lb/bu |
|
Spartan |
3 oz |
Fall |
93 |
81 |
81 |
93 |
83 |
81 |
97 |
84 |
2320 |
61.5 |
|
Spartan |
4 oz |
Fall |
99 |
97 |
93 |
100 |
87 |
87 |
95 |
90 |
2411 |
62.6 |
|
Spartan |
5.33 oz |
Fall |
99 |
98 |
99 |
100 |
95 |
94 |
100 |
96 |
2793 |
62.4 |
|
Spartan /
Tough |
3 oz /
1.5 pt |
Fall /
POST |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
2406 |
62.6 |
|
Spartan /
Tough |
4 oz /
1.5 pt |
Fall /
POST |
100 |
100 |
100 |
100 |
100 |
99 |
99 |
100 |
2048 |
62.2 |
|
Spartan /
Tough |
5.33 oz /
1.5 pt |
Fall /
POST |
99 |
100 |
100 |
98 |
100 |
100 |
99 |
98 |
2846 |
62.4 |
|
Spartan |
3 oz |
PRE |
100 |
100 |
96 |
94 |
90 |
91 |
95 |
90 |
2528 |
62.5 |
|
Spartan |
4 oz |
PRE |
100 |
100 |
100 |
98 |
94 |
94 |
96 |
93 |
2302 |
62.4 |
|
Spartan /
Tough |
3 oz /
1.5 pt |
PRE /
POST |
100 |
100 |
100 |
98 |
98 |
100 |
92 |
92 |
2870 |
62.4 |
|
Spartan /
Tough |
4 oz /
1.5 pt |
PRE/
POST |
100 |
100 |
100 |
100 |
100 |
100 |
97 |
97 |
2777 |
62.9 |
|
Tough |
1.5 pt |
POST |
92 |
100 |
100 |
85 |
99 |
98 |
47 |
55 |
2263 |
62.5 |
|
Untreated |
|
|
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
808 |
61.9 |
|
LSD (0.05) |
|
|
7 |
7 |
9 |
9 |
8 |
6 |
8 |
13 |
658 |
NS |
|
CV |
|
|
4 |
5 |
6 |
6 |
5 |
4 |
6 |
9 |
16 |
0.9 |
aSelect + COC (5
fl oz + 1% v/v) was applied postemergence alone or with Tough to all treatments
to control grasses.
There was no visible
chickpea injury with any treatment at any evaluation date. This study and
others have demonstrated that chickpeas have excellent tolerance to Spartan.
Most herbicide treatments
in this study provided good to excellent control of kochia, redroot pigweed, and
wild buckwheat. Weed control with the low Spartan rate (3 oz) applied in the
fall began to falter late in the growing season. Weed control was best where
Tough was applied postemergence following Spartan. Tough applied alone provided
excellent kochia and pigweed control, but did not control wild buckwheat.
There was a significant
difference in chickpea yield between herbicide treatments; however, treatment
yields were affected by where the replicates were located within the study
area. Yields tended to be higher on the southern half of the study area, which
remained more moist during the growing season.
Therefore, we recommend that
yield differences be disregarded.
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