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NoorhidayahR., Musthafa M.B. and Sisno 2021. Fourier Transform Infrared (FTIR) Spectroscopy of Humic Acid from Chicken Manure Compost with Different Biodecomposers: Spectroskopi Fourier Transform Infrared (FTIR) Asam Humat dari Kompos Kotoran Ayam dengan Biodekomposer Berbeda. Jurnal Ilmu Tanah dan Lingkungan. 23, 1 (Apr. 2021), 38-43. DOI:https://doi.org/10.29244/jitl.23.1.38-43.