The influence of joint use of agrochemicals (plant growth regulators, liquid complex fertilizers and bacterial preparations) on the formation of productivity elements and yields of a number of agricultural crops: spring barley, corn, sunflower. In carrying out the work, conventional methods of research were used: field, laboratory, analytical-computational, comparative and systemic generalization of the results obtained. As a result of the research, rational ways of joint use of plant growth regulators, liquid complex fertilizers and bacterial preparations have been determined. It has been established that the joint use of agrochemicals on spring barley raises yields by 10-19%, on corn to 17% and on sunflower to 11%. The significant economic effect of the proposed technological solution is proved.