The addition of which substance is least likely to result in immediate nitrogen loss from the soil?

A. Nitrapyrin
B. Urea
C. Dicyandiamide (DCD)
D. Calcium carbonate
E. Ammonium nitrate

Key Notes

Nitrapyrin is a nitrification inhibitor that slows the conversion of ammonium to nitrate, thereby reducing nitrogen losses through leaching and denitrification. Unlike nitrogen fertilizers or lime, it does not add nitrogen directly and instead helps retain applied nitrogen in the soil for longer periods.