Figure 8: Effect of wheat straw-olive-mill solid waste (W-OMSW), cow manure olive-mill solid waste (C-OMSW) and cow manure-wheat straw-olive-mill solid waste (C-W-OMSW) composts at two time intervals on pigment fractions concentrations (mg g-1 fresh wt.) of Vicia faba L. Considering the control values 5.663 and 3.821 mg g-1 fresh wt. at two and five months, respectively.