Increasing of “Keprok” Citrus Production in the Andisols of Karo by a Local Compound Fertilizers - Tuherkih, Enggis; Indonesian Center for Agricultural Land Resource Research and Development, Agency for Agricultural Research and Development. Present address: Jl. Ir. H. Juanda No. 98, Bogor 16123, Indonesia. (UNIVERSITY OF LAMPUNG, 2018)