penetrabilitypenetration resistancepenetrometerpercent base saturationpercolation soil waterpereglicperiglacialpermafrostpermafrost tablepermanent chargepermanent wilting pointpermeability soilperoxpesticidespetrocalcic horizonpetroferric contactpetrogypsic horizonph dependent chargeph hydrolyticph isohydricph soilphasephcphellemicphosphatephosphate fixationphosphate or potash fixationphosphate rockphosphobacteriaphosphoric acidphosphorus fixationphosphorus pentoxidephotolithotrophphotomapphototrophicphototropicphyllosilicate mineralsphyllospherephyric fabricphysical propertiesphysical weatheringphysiosorptionphytogenic soilsphytolithphytometerphytomorphic soilphytotoxicpiedomentpipepit and mound topography
