ABSTRACT
Among the essential plant food nutrients, phosphorus (P) is of particular interest as it is a non-renewable (finite) resource and means of its production other than mining are unavailable. With about 90% of known phosphate rock reserves found in only a few countries, the slowly declining reserves have stimulated a lively discussion (“Peak phosphorus”) on sustainable P management and P recovery before it ends in waterways (Cordell et al., 2011; Edixhoven et al., 2014; Sartorius et al., 2012).
