The aim of this research was to determine the optimal NPK fertilizer dosage for oil palm plants after the dry season and to study the response of oil palm plants in peat swamp land to NPK fertilizer. The study was conducted at the PT. Buyung oil palm plantation in Pulau Negara Village, Pemulutan Barat District, Ogan Ilir Regency, South Sumatra, with the position of 3°11’17”S 104°42’04…