Oakes Irrigation Research
Site
Carrington Research Extension Center * North Dakota State University
P.O. Box 531, Oakes, ND 58474-0531, Voice: (701) 742-2189, FAX: (701)
742-2700, email: rgreenla@ndsuext.nodak.edu
Richard Greenland
Table 77. Number of ears per acre and yield of se sweetcorn
Table 78. Husk and ear characteristics of se sweetcorn
Two new herbicides have become available for weed control in sweetcorn. There is some concern that some sweetcorn hybrids may be injured by these new herbicides. We tested the sweetcorn hybrids received for the sweetcorn performance trials for their tolerance to Aim and Callisto.
MATERIALS AND METHODS
The experimental procedure was the same as for the sweetcorn hybrid performance trials (see pages 40 and 47). The outside rows of each plot were sprayed with either Aim EC (0.5 oz/acre) or Callisto (3 oz/acre) on June 11 when the sweetcorn was 4 to 7 inches tall. The sweetcorn in the outside rows was harvested at the same time as the center rows were harvested. Because the herbicide treated rows were the outside rows they would have experienced greater influence from adjacent plots than the middle rows from where the regular sweetcorn harvest was taken.
Callisto did not injury any sweetcorn and did not effect yield or any characteristics of the sweetcorn. Aim burned the leaves of all the sweetcorn shortly after application. In the supersweet sweetcorn this injury was transitory and did not effect yield or any corn characteristics. Injury was more severe in the sugar enhanced (se) sweetcorn and yields were reduced slightly (see Table 77). Aim increased husk tightness, decreased percentage of ears with short shanks, and decreased ear diameter (Table 78). It had little effect on other ear characteristics.
The difference in response to Aim between supersweet and sugar enhanced sweetcorn may have been due partly to the growth stage of the sweetcorn when Aim was applied. Aim was applied the same day to both types of sweetcorn, but the supersweet sweetcorn was younger and smaller than the sugar enhanced sweetcorn. The Aim label allows for applications from before planting up to the 8-leaf collar growth stage.
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Table 77. Number of ears per acre and yield of se sweetcorn in the Oakes Irrigation Research Site 2003 sweetcorn herbicide study.
Herbicide |
Early plant injury |
Unhusked |
Husked |
||||||
marketable |
total |
marketable |
total |
||||||
ears |
yield |
ears |
yield |
ears |
yield |
ears |
yield |
||
|
% |
1000s/A |
tons/A |
1000s/A |
tons/A |
1000s/A |
tons/A |
1000s/A |
tons/A |
|
|||||||||
Aim |
19 |
21.9 b1 |
8.7 b |
24.1 |
9.2 b |
19.8 b |
5.0 b |
24.0 b |
5.6 b |
Callisto |
0 |
23.3 a |
9.5 a |
25.3 |
9.9 a |
21.7 a |
5.7 a |
25.3 a |
6.3 a |
Check |
0 |
23.1 a |
9.3 a |
25.2 |
9.7 a |
21.5 a |
5.6 a |
25.2 a |
6.1 a |
|
|||||||||
Probability |
<.0001 |
0.013 |
<.0001 |
0.052 |
<.0001 |
0.002 |
<.0001 |
0.03 |
<.0001 |
C.V. (%) |
44 |
12 |
10 |
12 |
9 |
15 |
13 |
12 |
10 |
1Values in the same column followed by the same letter are not significantly different at the 0.05 level. No significant differences between values in the column without letters.
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Table 78. Husk and ear characteristics of se sweetcorn in the 2003 Oakes Irrigation Research Site sweetcorn herbicide study.
Herbicide |
Husk color1 |
Distance husk over tip2 |
Husk tight- ness3 |
Percent short shank |
Husk overall score |
Ear length |
Ear diameter |
Ear overall score |
|
1 to 3 |
inches |
1 to 3 |
% |
1 to 10 |
-------- inches ------- |
1 to 10 |
|
|
||||||||
Aim |
2.0 |
2.2 |
2.3 a4 |
75 b |
7.5 a |
8.1 |
1.78 b |
7.3 ab |
Callisto |
1.9 |
2.1 |
2.2 ab |
79 a |
7.4 ab |
8.2 |
1.83 a |
7.5 a |
Check |
1.9 |
2.1 |
2.1 b |
81 a |
7.3 b |
8.0 |
1.81 a |
7.3 b |
|
||||||||
Probability |
0.27 |
0.58 |
0.005 |
0.002 |
0.02 |
0.06 |
0.0014 |
0.04 |
C.V. (%) |
8 |
19 |
14 |
12 |
5 |
5 |
4 |
6 |
1Color of husk. 1 to 3 is light to dark green.
2The distance the husk extends beyond the end of the ear.
3How tight husk is around ear. 1 = loose; 3 = tight.
4Values in the same column followed by the same letter are not significantly different at the 0.05 level. No significant differences between values in columns without letters.
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