Abstract: A nutrient concentrate for stimulation of growth for the accelerated cultivation and growth of hydrocarbon-consuming microorganisms as well as a process for their use in bioremediation is disclosed. The concentrate is an admixture of water-soluble and/or oil-soluble compounds of phosphorus (P) and nitrogen (N) and other components. The concentrate is in the form of a liquid water-based preparation and contains an ester of phosphoric acid as both an emulsifier and a P source. Further, from 10 to 40% by weight urea is contained in the concentrate as a N source. The invention also relates to the treatment of polluted soils, waters, and articles using a diluted aqueous solution of the concentrated admixture.