“…These techniques have been used to assess the P speciation in manures, composts, agro‐industrial by‐products, and waste materials, including sewage sludge (Frossard et al, 1994; Frossard et al, 1997; Frossard et al, 2002; Hunger et al, 2008; Kruse et al, 2010; Peak et al, 2002; Seiter et al, 2008; Shober et al, 2006; Sinaj et al, 2002). However, little information is available on the P speciation of untreated and thermo‐chemically treated SSAs.…”