Objective:
To identify the optimum planting dates and varieties of winter canola in Northwestern Montana.
Personnel:
Clint Beiermann, Jessica Pavelka, Jessica A. Torrion, David Larson
Summary:
Seven varieties of canola were planted in the Fall of 2022 at three different planting dates, 15 August, 1 September, and 15 September. It was irrigated only just after planting to assist in stand establishment and was grown under rainfed condition for the growing period in 2023. The study was harvested on 18 August 2023. Detailed cultural information is shown in Table 1.
There is no difference in yield between the planting dates, with 23.8 bu/A average yield as shown in Table 2. The greatest stand loss, 84%, was observed in the latest planted canola whereas, the first and second planting dates had better plant survival as shown in Table 3. Rubisco Mercedes had the highest yield (32.3bu/A) and CP225WRR the lowest (15.6 bu/A) as shown in Table 4.
Table 1. Management information
| Seeding date: |
08/15/22-09/15/22 (227-258) |
Field Location: | Y10 |
| Harvest date: | 8/18/2023 (230) | ||
| Seeding rate: | 9.5 lbs/A | Soil type: |
Creston Silt Loam |
| Previous crop: | Barley | ||
| Herbicide: | Buccaneer, Wheelhouse | Tillage: | Conventional |
| Insecticide: | Lambda | Soil residual nutrient (NO3-1, P, K lb/A): | 95.5, 12, 133 |
| Fungicide: | N/A | Nutrient fertilizer applied( N, P2O5, K20 lb/A): | 60, 25, 60 |
Table 2. Canola yield by planting date
| Date | Yield (bu/A) | |
| 15-Aug | 22.4 | A |
| 01-Sep | 24.8 | A |
| 15-Sep | 24.1 | A |
Table 3. Canola stand loss by planting date
| DATE | % Stand loss | |
| 15-Aug | 46 | B |
| 01-Sep | 61 | B |
| 15-Sep | 84 | A |
Table 4. Canola yield by variety
| Variety | Yield (bu/A) | |
| Rubisco Mercedes | 32.3 | A |
| Kicker | 26.8 | AB |
| Rubisco PluraxCL | 23.8 | B |
| Surefire | 23.6 | B |
| CP1066 | 23.6 | B |
| CP320WRR | 20.5 | BC |
| CP225WRR | 15.6 | C |