Characterisation of biochar from various carbon sources oleh Yulis Setyawan Hendrix, Mayang Sabrina Sunyoto Nimas, Sugiarto Yusron, Sue stining Dyah Dewanti Beauty, Tri Widayanti Vindhya, Hakim Lukman, Kurniawan Syahrul, Auliya Nugroho Ga bryna, Ulandari Devy, Choirun Annisa’u, Hanindipto Fasa Aditya, Arini Sundari Shaf ira, Akbar Pamungkas Ilham, Putra Agus Pratama Andhika, Wan Zhijian