Winter Canola Fertilizer Requirements
- Fertilizer recommendations are based on winter wheat and should be used as a reference.
- Soil should be tested prior to seedbed establishment. Test should include N, P, K, S and other micro nutrients.
- The major nutrients are required in about the following ratio. N - 5 lbs, P2O5 - 2.4 lbs, K2O - 4 lbs, S - 1 lb
- In general, canola required approx. 25% more N, P, and K and about twice as much S compared to wheat.
- Nitrogen can be banded for broadcast to the side of the seed. At lease 1 inch away from the seed.
- In the fall N, P, K, S should be broadcast prior to planting. Only about 1/3 of the required N should be fall applied. Excess N can reduce winter hardiness.
- Leaves in the fall determine winter hardiness.
- Spring (dormancy break) apply the other 2/3 of N.
- Limit use of liquid nitrogen because of limited absorption and potential burn.
- Leaves in spring will determine yield.
- N deficiency symptoms are yellowing of the lower, older leaves in the spring.
- P deficiency symptoms are poorly developed root system and purple spring leaves.
Canola Fertility Needs
Nitrogen Requirements for Winter Canola Production in the Great Plains
Fertility: Canola Requirements
Canola Council of Canada
Fertility N Requirements
Winter Canola - Sulfur Requirements
- Unlike winter cereals, canola has a high demand of S because of its high content of S-containing proteins. Sulfur allows the plant to use N efficiently.
- Soils with less than 10 ppm S should receive 25 lbs S per acre.
- Sulfur can be applied in the fall or with N in the spring.
- Ammonium sulfate is preferred over elemental form.
- Sulfur deficiency symptoms generally appear in the spring.
- Young leaves become chlorotic, poorly developed, cupped with a reddish purple tinge and flowers that are pale yellow.