A field experiment was carried out to study the effect of organic and bioorganic fertilizers
on growth parameters, yield and the quality of two broccoli cultivars (Calabrese and Southern star).
Bio-organic fertilizers gave better results for all vegetative growth parameters for Southern star cultivar
compared to Calabrese cultivar. Total phenolic content (TPC), total flavonoid content (TFC)
and total glucosinolates content (TGsC) were almost higher in Calabrese cultivar as a result of
organic fertilizer treatment. The antioxidant activities of both cultivars were evaluated and Calabrese
cultivar showed the higher1, 1-diphenyl-2-picrylhydrazyl DPPH. scavenging activity expressed
as IC50 (its concentrations for 50% inhibition) (16.56 lg/ml) compared to Southern star (19.42 lg/
ml). In addition, Calabrese cultivar showed the higher chelating power (75.36 lg/ml) than Southern
star (72.43 lg/ml) at (30 lg/ml) when the organic fertilizer was applied. The results indicated that
there is a good margin for enhancing antioxidant compounds of broccoli for economic production
using organic fertilization. This study indicated the potential application of broccoli as a potent natural
source of antioxidants as nutraceuticals.