CAN contains nitrogen in ammonium and nitric forms. Ammonium nitrogen can be up taken directly by plants but more often is bound to clay particles in the soil where it will over time be nitrified into to nitric nitrogen. Nitric nitrogen moves through soil rapidly and is quickly up taken by plants.
Summer, Autumn, Winter, Spring
Avoid application before large amounts of rainfall (40ml plus within 10 hours) to reduce any leaching.