Determine if reduced rates of herbicides can provide adequate weed control and show no yield loss in no-tillage soybean utilizing pre-emergence and post-emergence herbicide applications.
| Cooperator: | Tim Warner |
| County of Site: | Darke |
| Nearest Town: | Greenville |
| Major Soil Type: | Brookston Silty Clay Loam |
| Drainage (List Type): | N/A |
| Irrigation: | No |
| Tillage: | None |
| Previous Crop: | Corn |
| Soil Test: | pH N/A P N/A K N/A |
| Fertilizer Applied: | N/A |
| Herbicide Program: | Listed in table |
| Plant Population: | 210,000 seeds per acre |
| Plant Population @Harvest: | N/A |
| Variety: | Becks 299 |
| Planting Date: | April 29, 1997 |
| Harvest Date: | September 24, 1997 |
The plot size for this study was 20 feet wide and 300 feet in length. Each treatment was replicated three times. 2,4-D ester at 1.0 pt/A plus Prime Oil (COC) was added to treatments 1-7 and applied alone to treatment 8 to control existing weeds seven days prior to planting. The 1X Canopy rate was 6.0 oz/A and 1X Squadron rate was 3.0 pt/A. The post-emergence application of Basagran + Poast HC + Prime Oil + 28% Nitrogen at the 1X rate was 2.0 pt/A + 10.0 floz/A + 0.5%v/v + 2.0%v/v and applied as listed in the table.
| Treatment and Rate1 | Treatment Timing1 | Weed Control on July 24, 19971 | Soybean Yield1 (bu/A) | Treatment Cost2 ($/A) | |
|---|---|---|---|---|---|
| Height (inch) | DAP | An. Gr. ( %) | |||
| 1. Canopy (EPP) 1/2X | - 7 | 86 | 62 | 12.06 | |
| 2. Canopy (EPP) 1/2X | -7 | ||||
| (POST) 1/4X | 1.25 | 52 | 93 | 61 | 22.09 |
| 3. Canopy (EPP) 1/2X | -7 | ||||
| (POST) 1/2X | 3.0 | 56 | 98 | 61 | 29.32 |
| 4. Squadron (EPP) 1/2X | -7 | 83 | 62 | 17.00 | |
| 5. Squadron (EPP) 1/2X | -7 | ||||
| (POST) 1/4X | 1.25 | 52 | 95 | 61 | 27.03 |
| 6. Squadron (EPP) 1/2X | -7 | ||||
| (POST) 1/2X | 3.0 | 56 | 98 | 63 | 34.26 |
| 7. Squadron (EPP) 1X | -7 | 83 | 61 | 29.16 | |
| 8. Roundup (POST) 1X | 8.0 | 65 | 95 | 63 | 37.56 |
| LSD (0.05%) | 7 | NS | |||
| 1 Abbreviations: Height = annual grass height, DAP = days after planting, An. Gr. = annual grass (giant foxtail and barnyardgrass), bu/A = bushels per acre, EPP = early pre-plant application, POST = post-emergence application, LSD = least significant difference, NS = no significant difference. | |||||
| 2 Treatment cost = cost of all herbicides and additives (including burndown) and application cost at $2.00/A/application. | |||||
The annual grass pressure was light to moderate and the annual broadleaf pressure was non-existent. Canada thistle was present, which is why Basagran was used, but the thistle population was not uniform enough to rate. Treatments 1, 4, and 7 provided less than 87% control of annual grass, but yield was not significantly reduced.
For additional information, contact:
Jeff Stachler and Dr. Mark Loux
Kottman Hall
The Ohio State University
2021 Coffey Road
Columbus, OH 43210
614-292-1393 or 614-292-9081
stachler.1@osu.edu or loux.1@osu.edu