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Barus, Junita and Lumbanraja, Jamalam and Sudarsono, Hamim and Dermiyati, - (2019) Improvement of several indicators of physical and biological properties of soil after adding crops biomass residues and yield of upland rice. JOURNAL OF DEGRADED AND MINING LANDS MANAGEMENT, 6 (2). pp. 1625-1634. ISSN 2339-076X