Tuherkih, Enggis, and . Sukristiyonubowo. 2018. “Increasing of ‘Keprok’ Citrus Production in the Andisols of Karo by a Local Compound Fertilizers”. JOURNAL OF TROPICAL SOILS 15 (3):213-19. https://doi.org/10.5400/jts.2010.v15i3.213-219.