The task of supplying plants in vegetable farms of the Russian Federation is relevant today. There is an urgent question about the implementation of carbon dioxide fertilization of plants in protected soil structures. The low concentration of carbon dioxide in the cultivation of plants serves as a factor limiting the yield. (Research purpose) The research purpose is to develop an algorithm for the microprocessor for supplying carbon dioxide to protected ground structures using electric nozzles. (Materials and methods) Since the content of carbon dioxide in the atmospheric air is only 0.03 percent, it is necessary to create an installation capable of dosing carbon dioxide. With insufficient air exchange, the CO2 content in greenhouses as a result of its intensive absorption by plants can fall below 0.01 percent and photosynthesis practically stops. The article presents the calculation to reduce the cost of protected crops using a carbon dioxide generation plant. The domestic and foreign literature have been analyzed. The article compares the characteristics of the injectors. There were described the method of calculating the number of injectors and the method of supplying carbon dioxide to the plants of the protected ground. (Results and discussion) The article presents the electrical equipment used in the installation. The electrical principle scheme of the installation includes the Mitsubishi FX2N microcontroller. The microcontroller is controlled by an algorithm for the supply of carbon dioxide. (Conclusions) It is possible to solve the problem of lack of carbon dioxide when growing plants by supplying gas with electric nozzles to the construction of a protected ground with direct control by a microcontroller. The use of electromagnetic nozzles makes it possible to dose the supplying of plants with CO2.