But the relatively high bulk densities at the depths of 0–10 and 10–25 cm may be due to cultivation and compaction, subsidence of peat soil, of the surface layers on drainage[16]. The fact that the pineapple estate has been under use for about 36 years and has good drainage systems supports this observation. The lower bulk density at the depth of 25–45 cm may be due to partial decomposition of plant materials. Observation has shown that the bulk density in most tropical peat soils is higher at the surface layers than the subsurface layers as the former surfaces tend be more sapric (full decomposition) than the latter layers[16]. This has been associated with climate, height of water table, and oxidation[16]. Perhaps materials at the depth of 25–45 cm may have been lignified.