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Improved crop moisture may have improved the yield potential of canola crops. If nutrient availability does not match this new yield potential, in-crop top-dressing of nitrogen or sulphur (or both) could provide an economic benefit.
The sooner you can apply the extra fertilizer, the higher the benefit will be to the crop. For nitrogen, it will need to be available to the plant by the six-leaf stage. This means that the nitrogen fertilizer, granular (urea) or liquid (UAN), will need to have a rain to move it into the rooting zone. The use of enhanced efficiency fertilizers or products such as Agrotain will help protect your added investment until those rains come.
The Canola Encyclopedia explains how to diagnose nutrient deficiencies.
