This study aims to investigate the combined effects of potassium fertilizer application and harvesting rotation on the production and quality of palm oil content in oil palm (Elaeis guineensis Jacq.) grown on peatlands. The research was conducted on a 3-hectare smallholder oil palm plantation located in Kepenghuluan Ujung Tanjung, Tanah Putih District, Rokan Hilir Regency. The study spanned 6 m…