This investigation aimed to study the effect of some biofertilizers strains namely: Arbuscular mycorrhizal fungi (AMF), Azospirillum brasilense bacteria (AZSB) and Azotobacter chroococcum bacteria (AZBB) as well as their combinations on productivity and berries quality of Flame Seedless grapevines. The
study was carried out during two seasons 2018 and 2019 on grapevines grown under new reclamation sandy soil conditions at Matay distract, El Minia Governorate – Egypt. Results showed that the three examined
microorganisms strains were capable to significantly increase yield/vine and improve berries physical &chemical properties in both seasons. Inoculation with AMF showed superiority than AZSB or AZBB. Also, combined inoculations were more effective than single inoculations. However, the vines treated with
the triple mixture (AMF , AZSB and AZBB) gained the highest yield (kg/vine), berry weight(g), berry dimensions (cm), juice TSS (%) , juice sugar content (%) and juice total anthocyanins (mg/100g F.W.) during the two experimental seasons.