nitrification
noun [ U ] chemistry, biology specialized uk/ˌnaɪ.trɪ.fɪˈkeɪ.ʃən/ us/ˌnaɪ.trə.fəˈkeɪ.ʃən/
硝化作用(土壤中的细菌利用氧气,将植物腐殖质中的含氮化合物转化成可被吸收的硝酸盐的过程)
the process in which bacteria in the soil use oxygen to change compounds of nitrogen in dead plant material into nitrates which plants can then absorb as food