Interaction effect of skipping irrigation and co-inoculation with Bradyrhizobium and some strains of Bacillus bacteria on growth dynamics of cowpea (Vigna unguiculata L.) its yield and water productivity

North Nile Delta area, Egypt during the two successive growing seasons 2018 and 2019 to assess the interaction effect of skipping irrigation and co-inoculation of cowpea (Vigna 2019 to assess the interaction effect of skipping irrigation and co-inoculation of cowpea (Vigna radiata L.), with Bradyrhizobium sp. and some strains of Bacillus bacteria on growth dynamics, yield and water productivity.Spilt-plot design was used, the main plots were assigned to four treatments of water stress; I 1 : control treatment (no stress); I 2 : withholding one irrigation at the vegetative growth stage; I 3 : withholding one irrigation at the flowering growth stage; I 4 : withholding one irrigation at pod formation stage; while inoculation treatments were assigned to sub main plots which were: T 1 : inoculation with Bradyrhizobium sp.TAL 169 (control); T 2 : inoculation with Bradyrhizobium sp.TAL 169 + B. subtilis MF497446;T 3: inoculation with Bradyrhizobium sp.TAL 169 + B. coagulans NCAIM B.01123; T 4: inoculation with Bradyrhizobium sp.TAL 169 + B. circulance NCAIM B