This work aimed at evaluating the effect of compost to water ratio and nutrient additives on the compost tea (CT) quality and its efficacy on the maize growth and soil microbial activity and biomass as well as the colonization of maize roots with arbuscular mycorrhizal fungi (AMF). The CT were prepared at two ratios (1/5 and 1/10), and enriched with molasses and humic acid, date syrup and humic acid, or non-enriched. The oxygen concentration decreased over time in all CT and stabilized after 48 h at 5.1 ppm in non-enriched teas against 0 ppm in enriched ones. The addition of nutrients to CT decreased its pH on average to 5.1 and increased its organic matter content as well as N, P, K, Mg, Ca, and Mn concentrations as compared to non-enriched teas. Bacterial population was increased by more than 21% and microbial activity by 33% after 48 h in CT supplemented with additives. All CT inhibited Fusarium oxysporum albedinis with different rate with a maximal one of 84% attributed to CT supplemented with additives. The CT applied as a fertilizer under greenhouse conditions improved the maize height, diameter and biomass and increased the rhizosphere bacterial population and microbial biomass, and did not affect the colonization of roots with AMF. These findings suggest that quality CT prepared at suitable ratio and with additives could be a sustainable fertilizer and a promising solution to control soil-borne diseases.