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The using laser ablation of massive selenium targets, aqueous colloids of selenium nanoparticles were obtained. The resulting nanoparticles are monodisperse in size and mass. The paper presents the optical properties of nanoparticles, morphology and composition. It has been shown that selenium nanoparticles do not significantly affect the development of plants under reference conditions, but effectively level the effects of hyperthermia. The most effective concentration of selenium nanoparticles in the soil is a concentration of 10 μg / kg.