Sudrajat, S., Sukmawan, Y. and Sugiyanta, S. (2014) “Influence of Manure, Nitrogen, Phosphorus and Potassium Fertilizer Application on Growth of One-year-old Oil Palms on Marginal Soil in Jonggol, Bogor, Indonesia”, Journal of Tropical Crop Science, 1(2), pp. 18–24. doi: 10.29244/jtcs.1.2.18-24.