The Application of Some Biostimulant-Based Substances to Improve the Quality and Productivity of "Ruby Seedless" Grapevines c.v

Innovative and sustainable tools such as biostimulant-based substances play an important key role in the development of environment friendly viticultural strategies to improve yields and fruit quality. In this study, we investigated the effect of foliar spray application of two biostimulants, seaweed extracts made from Ascophyllum nodosum and effective microorganisms, alone or combined with each other, on increasing the vegetative growth of Vitis vinifera cv. Ruby Seedless. Two concentrations of (1g/L and 2g/L) were used for each substance to asset their impact on yield, chemical characteristics of berries, leaf area shoot length. All treatments showed a stimulatory effect for studied parameters. The results indicate that the vines treated with the lower levels of EM 1g/L combined with higher levels of seaweed A. nodosum 2g/L produced the highest absolute yield and least shot berries % relative to the untreated vines.