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.