“…Environmental pollution frequently arises from their impurities (Cd, U; Hartley et al, 2013;Kratz et al, 2016) and from over-fertilization (Rubaek et al, 2013). Further problems are the quick formation of stable and inaccessible compounds that limit plant P uptake (Shen et al, 2011) and the low agronomic efficiency of no more than 15 % of fertilizer P in the first year of application (Schnug et al, 2003). Many recent studies have targeted sustainable agriculture through improving P availability from applied fertilizers (Delgado et al, 2002;Schröder et al, 2011), increasing P-uptake efficiency from organic and inorganic P pools in the soil (Kaur and Reddy, 2014) and developing new technologies for P recycling from human and animal waste Herzel et al, 2016).…”