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. j Trop. Soils. 2016;20(1):29-36. doi:10.5400/jts.2015.v20i1.29-36