Selenium is a trace indispensable element for the most living creatures functioning. The laser ablation in water technology was proposed for Se zero-valent state nanoparticles producing as fertilizers and antioxidants. The main Se nanoparticles mass part shifted from 800 nm correspondingly the laser fragmentation time to the size less than 500 nm. The resulting nanoparticles were monodisperse in size and mass. The Se nanoparticles water suspension was introduced into the soil. The soil Se nanoparticles concentration was of 1, 5, 10, and 25 μg kg−1. Experiment was carried out in a climate chamber in two series. 1. Growing plants in soil imitating the standard organogenesis environment conditions: illumination of 16 hours per day, temperature of 22 °C, soil humidity of 25 % SDW, experiment duration of 30 days. 2. Growing plants in soil under changing conditions environment conditions of organogenesis. The standard environment conditions for the first 10 days: illumination of 16 h day−1, temperature of 22 °C, soil humidity of 25 % SDW. The plants stress for 5 days: hyperthermia of 40 °C. The standard environment conditions for the next 15 days: illumination of 16 h day−1, temperature of 22 °C, soil humidity of 25 % SDW. At standard organogenesis, the plant leaf plate surface area was of 30 ± 2 cm2 in control option, and at the Se nanoparticles doses correspondingly: 1 μg kg−1 of 32 ± 3 cm2, 5 μg kg−1 of 37 ± 2 cm2; 10 μg kg−1 of 38 ± 3 cm2; 25 μg kg−1 of 28 ± 4 cm2. The hyperthermia stressed plants growth has been studied. The highest plant growth rate was in Se nanoparticles concentration of 5 and 10 µg kg−1 options. The eggplant grown on the soil with Se nanoparticles addition at a concentration of 10 µg kg−1 leaf plate surface area was twice compared the eggplant grown on untreated soil. The same was for tomato plants. The cucumber plant leaf plate surface area grown using Se nanoparticles was by 50 % higher compared control option. The Biogeosystem Technique (BGT*) non-imitating a nature processes methodology was proposed of the 20–45 cm soil layer intra-soil milling for soil multilevel aggregate system formation and the intra-soil pulse continuous-discrete watering for controlled soil water regime. BGT* provides the Se nanoparticles better function in real soil ensuring a synergy effect on soil fertility of intra-soil mechanical processing, intra-soil water saving pulse continuous-discrete moistening, humics, polymicrobial biofilms, and nanoparticles.

Production and use of selenium nanoparticles as soil fertilizers

ACS Fall 2020 Virtual Meeting

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