Utoyo, B. . (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), pp. 224–231. doi: 10.25181/jppt.v22i3.2600.