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Purpose
 Evaluate Liberty herbicide application timing and cultivation timing for cover crop establishment in Liberty linked corn.
- Cooperator: Eldon Christophel
- Nearest town: Battle Creek
- Soil type: Sandy loam
- Tillage: Spring chisel with harrow
- Previous crop: Soybeans
- Hybrid: Great Lakes 4969LL
- Planting pop.: 21,900
- Planting date: May 6
- Manure: 6,000 gal/A (70-75 lbs. N)
- Nitrogen: 80 lbs./A (Urea)
- Harvest date: October 20
- Exp. design: RCB, four replications
Treatments
- Early Liberty application (20 oz/A, May 30, corn height 6-8") and one cultivation (June 8)
- Early Liberty application (20 oz/A, May 30, corn height 6-8") and one cultivation (June 15)
- Late Liberty application (28 oz/A, June 4, corn height 10-12") and one cultivation (June 15)
- Late Liberty application (28 oz/A, June 4, corn height 10-12") and one cultivation (June 22)
Cover crop seeded immediately following cultivation. Rate: 15 lbs./A annual ryegrass + 12 lbs./A crimson clover
Results
| Treatment |
Corn Yield
(bu/A) |
Crimson Clover
(biomass lb/A) |
Annual Ryegrass
(biomass lb/A) |
| 1 |
165 |
73 a |
396 |
| 2 |
165 |
20 b |
292 |
| 3 |
166 |
27 b |
264 |
| 4 |
167 |
23 b |
339 |
| LSD(0.05) |
NS |
34 |
NS |
Pictures of experiment.
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Early spray, early overseeding
June 22, 1998 |
Late spray, overseeding
July 1, 1998 |
Early spray, overseeding
October 20, 1998 |
Field view
December 11, 1998 |
Conclusions
There were no significant differences between corn yields. Crimson clover did significantly better in the first seeding date, but the later planting dates had no significant differences. There were no significant differences in the time of seeding annual ryegrass. This same experiment was conducted in 1999, and because of inadequate moisture, resulted in poor growth of cover crops. Cover Crops and Liberty Linked Corn 1999.
The following year the field was planted to no-till soybeans. A burndown was applied prior to planting.
This experiment was repeated in 1999. |
