ANS:A - nitrate nitrogen is quick acting

In calcium ammonium nitrate (CAN) fertilizer, nitrate nitrogen is quick-acting. CAN fertilizer is a type of nitrogen fertilizer that contains both ammonium nitrate and calcium carbonate. When applied to the soil, the ammonium nitrate component undergoes a rapid conversion into nitrate nitrogen, which is readily available for plant uptake. Nitrate nitrogen is known for its quick availability to plants, as it can be immediately absorbed through the roots and utilized for growth and development. Therefore, in CAN fertilizer, nitrate nitrogen serves as the quick-acting component, providing plants with a readily accessible source of nitrogen for their immediate needs.