The accurate determination of peak phosphorus is dependent on knowing the total world's commercial phosphate reserves and resources, especially in the form of phosphate rock (a summarizing term for over 300 ores of different origin, composition, and phosphate content). "Reserves" refers to the amount assumed recoverable at current market prices and "resources" refers to estimated amounts of such a grade or quality that they have reasonable prospects for economic extraction.
THe acCuraTe DEterMinAtIon Of Peak pHoSphorUs is dePENdent on knowinG the totaL WorLd'S cOmMerciAl pHoSphate resErVes and ResoUrcEs, eSPeCially IN tHe fOrm oF phoSphate Rock (A SummarIzInG term For Over 300 orEs of diffErENT oriGIn, cOmpOsitIoN, And phOsPhate content). "reseRVeS" REfers TO The amOunT assumEd reCoVerabLe At curRent market prices aNd "resourceS" rEfers to EstiMateD aMounTs of Such A GrAdE Or quaLITy tHat theY Have reaSonable PrOSPecTS fOr eCoNOmic eXtRacTIon.