Lumbanraja, P. . and Harahap, E. M. . (2015) “ENHANCING SOIL WATER HOLDING CAPACITY AND CATION EXCHANGE CAPACITY OF SANDY SOIL WITH APPLICATION OF MANURE ON SIMALINGKAR SOIL”, Jurnal Online PERTANIAN TROPIK, 2(1), pp. 74-88. doi: 10.32734/jpt.v2i1.2881.