NoorA. (2005) “The Role of Rock Phosphate and Farm Yard Manure Combined-Phosphate-Solubilizing Bacteria in Increasing Nutrient Uptake and Soybean Yield”, Jurnal Ilmu Tanah dan Lingkungan, 7(2), pp. 41-47. doi: 10.29244/jitl.7.2.41-47.