Global budget of major nitrification inhibitors (1980~2015)

The three most important nitrification inhibitors (NIs) applied worldwide are Dicyandiamide (DCD), 3,4-Dimethylpyrazole-phosphate (DMPP), and 2-Chloro-6-(trichloromethyl)-pyridine (Nitrapyrin) [1,2]. To assess the environmental fate of these NIs, a top-down model was developed to make a rough estimate of their global budget:Yj,t = ∑(i)[Nt ⋅ At ⋅ Bi,t ⋅ (Wi ± εi) ⋅ Fi,j,t ⋅1000]where i, j, and t denote the species of NIs use (i = 1 to 3; i.e., DCD, DMPP, and Nitrapyrin), the composition of NIs budget (j = 1 to 3; i.e., transport/degradation in biosphere, residue in soil, and leaching/runoff from soil), and the year (t = 1980 to 2015), respectively. Yj,t indicates the annual budget (Gg) of j. Other symbols: Nt, the amount (Tg) of N-fertilizers application; At, the percent (mass %) of N-fertilizers containing NIs; Bi,t, the share (mass %) of each NI use; Wi, the mixing ratio (mass %) of each NI to N-fertilizers; εi, the standard deviation (mass %) of Wi; Fi,j,t, the fraction (mass %) of different NI-flows for i. Please see details on the parameters in Tables 1~4. The results for global budget of major NIs (1980~2015) have been showed in Figure 1. Zhang, Y., Abalos, D., & Cheng, X. (2024). Global budget of major nitrification inhibitors (1980~2015). Figshare. https://doi.org/10.6084/m9.figshare.25498699.