phytosanitary treatment(Removal of heavy metals from water by the employment of plants or treatment by which plant organisms act to degrade hazardous organic contaminants or transform hazardous inorganic contaminants to environmentally safe levels in soils, subsurface materials, water, sludges, and residues)
phytosociology(The study of vegetation, including the organization, interdependence, development, geographical distribution and classification of plant communities)
pickling plant(Plant where scale is removed from iron and steel usually by means of immersion in a hot hydrochloric or sulphuric acid bath. Wastes include spent pickling liquor, sludges and rinse water)