Influence of the bentonite-containing acrylic humectant composite on the soil microflora
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Kuupäev
2019
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Abstrakt
Acrylic derivative-based superabsorbents are widely used currently in agriculture as
the soil conditioners, plant growth regulators, etc. Their usage has a positive effect on the growth
and survival of the plants cultivated in the arid regions. However, the effects of hydrophilic
acrylic polymers on the soil microbiocenosis still remain unknown. The influence of the moistureabsorbing acrylic acid-based hydrogels with different proportions of bentonite filler was studied
on the soil microbiota. N,N-methylenebisacrylamide was used as a crosslinking agent. Acrylic
hydrogels were synthesized by radical polymerization in an aqueous medium at a synthesis
temperature of 45 °C during 4 hours. The application of hydrogel of the certain concentrations
(1.0, 1.5, and 2.5% wt) into the soil did not cause significant changes in the total abundance of
heterotrophic bacteria and the length of the fungal mycelium. The CO2 emission rates did not
change after and during the application of the hydrogel), which indicated the same level of carbon
mineralization in the soil with presence of acrylic bentonite-containing hydrogels. The nitrogen
fixation rate decreased on the first day after hydrogel application; after 14 days, it was close to
the control values. We assume the activity of nitrogen-fixing bacteria has though turned to the
normal level.
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Märksõnad
acrylic hydrogels, bentonite, soil microflora, articles