Keywords: CCM; chisel cultivator on March 15th, 2013; DCM; disc chain on March 15th, 2013; CCA; chisel cultivator on April 5th, 2013; DCA; disc chain on April 5th, 2013; MicroRespâ¢; T-RFLP; Wheat; One-time tillage; Weed control; Soil bacterial communities;