Utilization of empty fruit bunch (EFB) char in the production of NPK slow release fertilizer (SRF) von Arfiana, Finalis, Era R., Fausiah, Noor, Ilhamsyah, Destian, Erbert F., Nuswantoro, Dorit B. I., Murti, S. D. Sumbogo, Saputra, Hens, Noda, Reiji

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