Abstract: A muddy borrow soil base material blasting nozzle which has a muddy borrow soil base material injection port having one end of throttled shape, a cylinder integrally provided at the end of the muddy borrow soil base material injection port, and an air intake port formed near the end of the injection port at the side face of the cylinder, the air intake port being used as an intake port of one or more threadlike, ropelike or tapelike continuous elements into the cylinder, and a process for preparing a vegetation bedrock using the muddy borrow soil base material blasting nozzle having the steps of press-fitting a muddy borrow soil base material into the blasting nozzle, blowing the threadlike, ropelike or tapelike continuous elements introduced by intaking from the air intake port of the blasting nozzle into the cylinder together with the muddy borrow soil base material from the discharging port of the nozzle toward the surface to be executed to prepare a plant germinating and growing bedrock.