Rivaie, A. A. (2016). Changes in Soil Available Phosphorus, Leaf Phosphorus Content and Yield of Sword Bean (Canavalia ensiformis (L.) DC.) by Application of SP-36 and Phosphate Rock on Acid Upland Soil of East Lampung. JOURNAL OF TROPICAL SOILS, 20(1), 29–36. https://doi.org/10.5400/jts.2015.v20i1.29-36