*9.1.2 Production of biofertilizer*

As noted in Section 6.3, fertilizer via ammonia synthesis is a huge fossil energy consumer and GHG emitter. One ton of oil, 108 tons of water, and 7 tons of CO2 are linked to one ton of synthetic fertilizer [159]. Inorganic fertilizer volatilizes ammonia, a known precursor [70], that enables nitrate and sulfate aerosols. Studies indicate that nitrates will be a major anthropogenic climate forcer in the future because of inorganic fertilizers in agriculture [160, 161]. Substitution with digestate biofertilizer generated from AD operations indicated viability. In cassava root production, a liquid fraction of CPR digestate could supplant up to 28% nitrogen, 11% phosphorus, and 38% potassium sourced from chemical fertilizers for cassava root production [83]. Digestate biofertilizer, therefore, seems to be a climate change mitigator.
