The main values of radical DPPH. scavenging activity of Calabrese, Southern star cultivars and butylated hydroxy toluene (BHT, as synthetic antioxidant agent) are shown in ( Fig. 1). Plant extract of broccoli cultivars grown with organic and bio-organic fertilizers exhibited a potential activity of scavenging DPPH. free radical compared to control (NPK) and synthetic antioxidant (BHT). The values of IC50 (the concentrations for 50% inhibition) Calabrese treated with organic and bio-organic fertilizers (Fig. 1)