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“Aktivitas fosfatase dan produksi asam organik di rhizosfer dan hifosfer bibit kelapa sawit bermikoriza *) Phosphatase activity and organic acid production in rhizosphere and hyphosphere of mycorrhizal oil palm seedling”, MP, vol. 71, no. 2, Mar. 2016, doi: 10.22302/iribb.jur.mp.v71i2.164.