Sukmawan, Yan, and Dewi Riniarti. “Effectiveness of Various Foliar Fertilizer on the Growth and Performance of Oil Palm (Elaeis Guineensis Jacq.) Seedlings in Main Nurseries”. Journal of Tropical Crop Science, vol. 9, no. 01, Feb. 2022, pp. 1-7, doi:10.29244/jtcs.9.01.1-7.