Figure 2.

Nitrification inhibition, exemplified by the isolated BNI compounds 1,9-decanediol, black, and methyl 3-(4-hydroxyphenyl) propionate (MHPP), blue; from data by Sun et al.¹⁹, `dots', Subbarao et al.⁶, ‘x’, and Zakir et al.¹⁷, ‘star’. Fitting function: $f_{\text{in}}\left(\text{BNI}\right)={\text{K}}_{\text{in}}/({\text{K}}_{\text{in}}+{\text{BNI}}^2)$. The inhibition by isolated MHPP is about 2.5–3 times stronger than 1,9-decanediol in assay. The ${\text{K}}_{\text{in}}$ for the two solid lines was ≈ 0.0595 mM². To obtain a first approximation for modeling inhibition, we used ${\text{K}}_{\text{in}}=0.00884$, dashed line.