Why is a nitrification inhibitor used in the test?

A nitrification inhibitor is used in tests to slow down the conversion of ammonium to nitrate in the soil, which helps to assess the effectiveness of fertilizers and their impact on nutrient availability. By reducing the rate of nitrification, these inhibitors allow for a more accurate measurement of nitrogen retention and minimize potential losses through leaching, thereby improving the understanding of nutrient dynamics in agricultural systems. This can lead to better management practices and enhanced crop yields.