Effect of nano clay and organic fertilizer amendments on the physico-chemical properties of soil affected by cold lava in Mount Marapi, IndonesiaAprisal, Adrinal, Yulna Fatmawita, Irwan Darfis, Zuldadan, Juniati, Putri Sherly Amelia and ZasqyaE3S Web Conf., 677 (2025) 01009DOI: https://doi.org/10.1051/e3sconf/202567701009