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Top dress: Identify N and S deficiency
Please read an updated version of this article. The Fertilizer section of the Canola Encyclopedia has more on nutrient deficiency symptoms. Look under the chapters headings for each nutrient.
Top dress timing
Please read an updated version of this article.
Top dress canola with sulphur deficiency
Without enough sulphur, canola cannot produce top yields – no matter how much of the other nutrients are available. Please read an updated version of this article.
Will a fertilizer top dress pay off?
Canola fields may benefit from a top-dress application of nitrogen or sulphur (or both) if logistics and weather prevented the full recommended application of fertilizer at or before seeding, and if improved weather conditions (rainfall, for example) have increased the yield potential of the crop. Please read the updated version of this article.