Interaction of Peat Soil and Sulphidic Material Substratum: Role of Peat Layer and Groundwater Level Fluctuations on Phosphorus Concentration - Fahmi, Arifin; (SCOPUS h-index: 4), Soil Science Division, Faculty of Agriculture, University of Lampung, Jl. Sumantri Brojonegoro No. 1, Bandarlampung 35145, Indonesia; Indonesia (UNIVERSITY OF LAMPUNG, 2015)