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Fig. 1. (a) Relationship between the combined inorganic P fractions according to Golterman as modified by Díaz-Espejo et al. (1999) and the combined P fractions according to the other two fractionation methods used: Olsen and Sommers (1982), and Ruíz et al. (1997). (b) Relationship between the sum of extracted P in the first three steps in the fractionation method of Ruíz et al. (1997) and the sum of extracted P in the first two step in the modified Golterman fractionation method (Díaz-Espejo et al., 1999).
