Evaluate various combinations and timing of Liberty post-emergence herbicide with atrazine for the control of grass and broadleaf weeds in corn.
| Cooperator: | Tom Weiler |
| County of Site: | Morrow |
| Nearest Town: | Chesterville |
| Major Soil Type: | Millgrove |
| Drainage: | Systematic |
| Irrigation: | None |
| Tillage: | Fall chisel and field cultivate |
| Previous Crop: | Soybeans |
| Soil Test: | pH 7.0 P 23 ppm K 154 ppm |
| Fertilizer: | 180 # NH3 preplant + 46 # P2O5 + 120 # K2O + 11 gal. 10-34-0 |
| Plant Population: | 26,700/A |
| Plant Population @Harvest: | 25,800/A |
| Variety: | Bird 63XPT |
| Planting Date: | May 8 |
| Harvest Date: | October 30 |
| Herbicides | Rate/Ac. | Growth Stage | Control Rating (%) | Costs/Ac | |||||
|---|---|---|---|---|---|---|---|---|---|
| Annual Grass | Lambs- quarters | Giant Ragweed | Herbicide $ | Application $ | Total $ | ||||
| Liberty | 28 oz. | LPO | 25.20 | 4.00 | 35.97 | ||||
| Atrazine | 1.5 lb. | LPO | 95 | 94 | 88 | 5.58 | |||
| AMS | 2.0%w/w | LPO | 1.19 | ||||||
| Liberty | 20 oz. | LPO | 18.00 | 4.00 | 51.96 | ||||
| Atrazine | 1.5 lb. | LPO | 5.58 | ||||||
| AMS | 2.0%w/w | LPO | 99 | 99 | 95 | 1.19 | |||
| Liberty | 20 oz. | EPO | 18.00 | 4.00 | |||||
| AMS | 2.0%w/w | EPO | 1.19 | ||||||
| Atrazine | 1.0 lb. | PRE | 3.72 | 4.00 | 30.91 | ||||
| Liberty | 20 oz. | LPO | 95 | 99 | 89 | 18.00 | 4.00 | ||
| AMS | 2.0%w/w | LPO | 1.19 | ||||||
| Atrazine | 2.0 lb. | PRE | 7.44 | 4.00 | 41.83 | ||||
| Liberty | 28.0 oz. | LPO | 99 | 92 | 90 | 25.20 | 4.00 | ||
| AMS | 2.0%w/w | LPO | 1.19 | ||||||
| Liberty | 20.0 oz. | EPO | 18.00 | 4.00 | 25.98 | ||||
| Atrazine | 0.75 lb. | EPO | 97 | 99 | 88 | 2.79 | |||
| AMS | 2.0%w/w | EPO | 1.19 | ||||||
| Liberty | 20.0 oz. | EPO | 18.00 | 4.00 | 46.38 | ||||
| AMS | 2.0%w/w | EPO | 99 | 92 | 88 | 1.19 | |||
| Liberty | 20.0 oz. | LPO | 18.00 | 4.00 | |||||
| AMS | 2.0%w/w | LPO | 1.19 | ||||||
| All treatments were replicated four times. | |||||||||
| Control Rating - percent of weeds controlled. Control rating values are the average of all four replications. | |||||||||
| PRE - Pre-emergent application | |||||||||
| EPO - Early post-emergence - weeds less than 3 inches | |||||||||
| LPO - Late post-emergence - weeds generally in the 4- to 12-inch range | |||||||||
| Prices used were in-season retail prices. Application cost used was $4.00 per acre. Costs may and will vary among farms. | |||||||||
Liberty is a new non-selective grass and broadleaf post-emergence herbicide that can be used on corn with the Liberty-linked gene incorporated in it. The Bird 63XPT variety yielded 190.3 bushels per acre. The weed pressure was severe at the evaluation site.
For additional information, contact:
Steve Ruhl
Ohio State University Extension - Morrow County
871 W. Marion Rd., Suite 102
Mt. Gilead, OH 43338
419-947-1070
ruhl.1@osu.edu