Utoyo, B. et al. 2022. Application of KNO3 and NPK Fertilizers on Double Tone Oil Palm (Elaeis Guineensis Jacq.) Seedling Growth in Main-Nursery. Jurnal Penelitian Pertanian Terapan. 22, 3 (Dec. 2022), 224–231. DOI:https://doi.org/10.25181/jppt.v22i3.2600.