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Weed control in no-till
dry pea (2003)
Majoret dry peas were seeded
April 28 at 150 lb/A. Individual plots were 10 x 30 ft and replicated three
times. PRE and POST treatments were applied April 30 and May 31, respectively.
Kochia (Kocz) was the primary weed evaluated. Dry peas were harvested Aug 1.
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|
|
|
Kocz |
Dry pea |
|
Treatmenta |
Rate |
Timing |
May 31 |
Jun 20 |
Yield |
Test wt |
|
|
|
|
—% control — |
lb/A |
lb/bu |
|
Roundup/
Raptor +
Basagran +
NIS + 28% N |
13 fl oz/
4 oz + 1 pt +
0.25% v/v + 1
qt |
PRE/
POST
|
|
100 |
2444 |
64.8 |
|
Roundup + Spartan/
Select + COC
|
13 fl oz + 2.67 oz/
5 fl oz + 1%
v/v |
PRE/
POST |
97 |
99 |
2774 |
64.4 |
|
Roundup + Spartan/
Select + COC |
13 fl oz + 4 oz/
5 fl oz + 1%
v/v |
PRE/
POST |
99 |
98 |
2693 |
64.3 |
|
Roundup + Spartan/
Select + COC |
13 fl oz + 5.33 oz/
5 fl oz + 1%
v/v |
PRE/
POST |
100 |
100 |
2395 |
64.2 |
|
Roundup/
Basagran +
Poast + COC |
13 fl oz/
2 pt +
1 pt + 2 pt |
PRE/
POST
|
|
100 |
2583 |
64.6 |
|
Roundup + Spartan/
Basagran +
Poast + COC |
13 fl oz + 2.67 oz/
1 pt +
1 pt + 2 pt |
PRE/
POST
|
95 |
100 |
2694 |
64.9 |
|
Roundup + Spartan +
Sencor/
Select + COC |
13 fl oz + 4 oz +
0.33 lb/
5 fl oz + 1%
v/v |
PRE/
POST
|
98 |
100 |
2610 |
64.9 |
|
Untreated |
|
|
0 |
0 |
2618 |
65.3 |
|
Handweeded checkb |
|
|
100 |
100 |
2796 |
65.0 |
|
LSD (0.05) |
|
|
5 |
2 |
NS |
0.6 |
|
CV |
|
|
3 |
1 |
12 |
0.6 |
aRoundup
treatments were Roundup UltraMax applied with AMS at 2.5 gal/100 gal.
bRoundup
UltraMax followed by Select + COC were applied to aid handweeding.
We evaluated several PRE
and POST herbicide treatments for dry pea tolerance and weed control. All
treatments provided excellent kochia control.
Statistically, there was no
significant yield difference between treatments. Yields were somewhat variable
between reps, which was partially due to crop injury from herbicide carryover
from 2002. In late May, the dry pea crop started to exhibit symptoms consistent
with clopyralid injury. Unfortunately, we failed to remember that Curtail (clopyralid
+ 2,4-D) was applied to this field in 2002. Dry pea tolerance to herbicides in
this study was not evaluated due to the confounding effect of the herbicide
carryover from 2002. Dry pea injury due to Curtail carryover was not as severe
in this no-till study compared to the conventionally-tilled study in the same
field.
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