Ecological Systems and Devices Annotation << Back Increased Productivity of Protected Soil Plants When Treated With Green Microalgae and Cyanobacteria Bataeva Yu.V., Grigoryan L.N., Bataeva A.D. Currently, increasing crop yields and pest control with the help of microorganisms is becoming increasingly important. Limitations in their commercial production for agricultural use include insufficient technological innovation and huge expectations of increased yields, as well as modern monetization of their environmental benefits. The effect of soil cyanobacteria and green algae on the growth and development of cucumber plants in greenhouse soil is studied. The treatment of plants with cyanobacteria had the greatest effect, estimated by increasing yield – 47.2 kg, compared with negative (16.5 kg) and positive (31.1 kg) controls. Keywords: cyanobacteria, green algae, phytostimulating activity. DOI: 10.25791/esip.5.2025.1523 Pp. 49-54.