Porosity of biochar is a key factor in its effectiveness as a soil amendment and its ability to retain water and nutrients. Biochar’s porosity is influenced by feedstock type and pyrolysis temperature, and it plays a crucial role in microbial activity and overall soil health. Biochar contains a wide range of pore sizes, including micropores (<2 nm), mesopores (2-50 nm), and macropores (>50 nm).