“Managing Applied Nitrogen on Winter Canola in the Pacific Northwest”

Idaho Oil Seed ConferenceFebruary 12, 2009

Moscow, Idaho

Don Wysocki, Tom Chastain,

Daryl Ehrensing and Nick Sirovatka Oregon State University

Columbia Basin Agricultural Research CenterPendleton, Oregon

541-278-4396 dwysocki@oregonstate.edu

Objective

Determine the optimum nitrogen fertilizer rate for winter canola

Eastern Oregon

Willamette Valley

OSU Canola Fertilizer Guidehttp://extension.oregonstate.edu/catalog/pdf/em/em8943-e.pdf

Nitrogen

Nitrogen recommendation for various expected yields.

Expected Yield (lb/acre)

Nitrogenlb/acre

1000 70

2000 1403000 2104000 280

Nitrogen Recommendation

(Exp. Yield X N Requirement) - Soil test nitrogen

Example: 3000 lb expected yieldSoil test = 0-1 ft 30

1-2 ft 20 2-3 ft 15

(X 7lb/100lb = 210 - 65 = 145 N/acre

Rosette Bolt Bloom

N %

0

4.94.4

4.0

2.5 2.4

1.61.1 1.2

Sowing WinterRosette

SpringRosette

Bolting FirstBloom

EarlyBloom

FullBloom

PodFilling

Harvest

N %

92

51

28

8

34

102

13

33

0

20

40

60

80

100

120

DM X 100 N S P

lb/ac

re

Straw Seed

Nitrogen rates on winter canola

N Treatmentrate lb added per 100 lb of expected grain yield

0 0.5X 3.51X 7.0

1.5X 11.02X 14.0

Sowing Date: Sept. 18, 2007. Previous crop: Winter Wheat Cultivars Athena Irrigation : 3” prior to plant 11” April to harvest 5 replications Assure II November 17 Soil Test: 50 lb N/acre 0-3’Expected Yield: 4000Pre-plant N: 0, 120, 240, 360, 480 (46-0-0)

Harvest: “push” June 23, combine July 8

Hermiston Trial 2007-2008

0 (0) 120(.5x) 240(1x) 360(1.5x) 480(2x)0

1000

2000

3000

4000

5000

6000

7000

8000

1667

2915 32723605

3075

Yield of winter canola with applied N, Hermiston 2008

Applied Nitrogen lb/acre

Yield Lb/acre

0 (0) 120(.5x) 240(1x) 360(1.5x) 480(2x)0

1000

2000

3000

4000

5000

6000

7000

8000

1667

29153272 3605

3075

Yield of winter canola with applied N

Applied Nitrogen lb/acre

Yield Lb/acre

7 lb N / 100 lb Yield

0 (0) 120(.5x) 240(1x) 360(1.5x) 480(2x)0

1000

2000

3000

4000

5000

6000

7000

8000

0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

16.0

18.0

20.0

1667

2915

3272

3605

3075

3.0

5.8

8.9

11.4

17.2

Yield of winter canola with applied N

Applied Nitrogen lb/acre

Yield Lb/acrelb N/100 lb Yield

Sowing Date: Sept. 11, 2007. Previous crop: Grass seedFour cultivars: Athena, Baldur, Kronos, Virginia, 4 replications Herbicide: Trefan PPI

Pre-plant N: 50 lb N/acre dry (46-0-0)Spring N: 0, 50, 100, and 150 lb/acre February 20

Harvest: swath June 27, combine July 11

Corvallis Trial 2007-2008

0 50 100 1500

1000

2000

3000

4000

25222757

29593028

N Trial Corvallis (4 cultivars)

Applied N lb/acre

Yield lb/acre

0 50 100 1500

1000

2000

3000

4000

0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

10.0

25222757

2959

3028

5.06.3

7.6

9.1N Trial Corvallis (4 cultivars)

Applied N lb/acre

Yield lb/acre

lb N/ 100 lb Yield

Summary

Canola has N requirements similar to wheat

Critical

Yield recommendations of 7 lb N/100 lb grain yield reasonable provided drought or heat do not lower expected yields

Split applications are recommended in the Willamette Valley, with majority of N in the early spring