Where an acronym is used for an organisation then this will appear in the Organisations section.

  PAH : Polycyclic Aromatic Hydrocarbons.

  PAR : Photosynthetically Active Radiation.

  PAS : Pitch Advisory Service.

  PBAT : Polybutylene adipate terephthalate, a biodegradable plastic.

  PBS : Polybutylene succinate, a biodegradable plastic.

  PCD : Passive Capillary Drainage.

  PCR : The Petroleum (Consolidation) Regulations 2014.

  PCS : Pesticide Control Service.

  PCSCU : Polymer Coated Sulphur-Coated Urea.

  PCSU : Polymer Coated Sulphur-coated Urea.

  PDCA : Plan-Do-Check-Act.

  PE : Polyethylene.

  PERT : Program (sometimes referred to as Project) Evaluation and Review Technique.

  PEST [2] : Political, Economic, Social-cultural (or Sociological) , and Technological.

  PESTLE : Political, Economic, Social-cultural (or Social or Sociological), Technological, Legal and Environmental.

  PET : Polyethylene terephthalate.

  PGF : Pitch Grading Framework.

  PGPR : Plant Growth Promoting Rhizobacteria.

  PGR : Plant Growth Regulator.

  pH [1] : Potential or power of Hydrogen.