This research was carried out from January 2022 to December 2023, at PT Tunggal Mitra Plantation, Manggala 3 Palm Oil Plantation, Rokan Hilir Regency, Riau Province. The research was divided into two stages, where the first stage was a field experiment that ran for two years which aimed to determine the effect of ameliorant application on the chemical and biological properties of peat soil as w…