June 15 Quiz — Nutrient top dress

Three questions to test the basics on top-dressing fertilizer.


1. Nitrogen fertilizer should be in place before the crop needs it. At what canola crop stage does N uptake really start to ramp up?
2. What nitrogen fertilizer source is NOT recommended for top dressing?
3. A top dress of 10-20 lb./ac. (actual) of sulphur can fix a sulphur deficiency in canola. Three of the following are symptoms of sulphur deficiency. One is not. Which one doesn't belong?