Budianta, D., Wiralaga, A. Y. A. and Lestari, W. (2018) “Changes in Some Soil Chemical Properties of Ultisol Applied by Mulch from Empty Fruit Bunches in an Oil Palm Plantation”, JOURNAL OF TROPICAL SOILS, 15(2), pp. 111–118. doi: 10.5400/jts.2010.v15i2.111-118.