Kids, Bacteria & Chemistry on a Organic Farm?..

Double Inoculating soybeans with the kids and a cement mixer. Is double inoculant over kill? We find in sandy poor soils sometimes the wet or dry Rhizobia backteria does not respond to the soil like it should and we don't really know why. So due to the minimal expense agronimist been having us double inoculate with both. We replace a portion of the water recipie with the liquid Rhizoba.