Humic substances enhance the performance of polyelectrolyte-based formulations as soil conditioners

Yakimenko, O.S.; Panova, I.G.; Novoskoltseva, O.; Gruzdenko, D.; Pozdnyakov, L.; Kadulin, M.; Stepanov, A.A.; Terekhova, V.; Yaroslavov, A.

Авторы: Yakimenko O.S., Panova I.G., Novoskoltseva O., Gruzdenko D., Pozdnyakov L., Kadulin M., Stepanov Andrey A., Terekhova V., Yaroslavov A.
Сборник: Book of Abstracts. Ninth International Conference of the CIS IHSS on humic innovative technologies "Humic substances and green technologies" (HIT-2024)
Тезисы
Год издания: 2024
Место издания: Non-Commercial Partnership “Center for Biogenic Resources “Humus Sapiens” (NP CBR “Humus Sapiens”) Москва
Первая страница: 56
Последняя страница: 56
Аннотация: Hydrophilic polyelectrolytes (PE) are considered as perspective tools to optimize soil properties and find increasing applications in agricultural technologies. Among them is hydrolyzed polyacrylonitrile (HYPAN), a linear polyanion. Synthetic HYPAN mixed with humic substances in a binary polymer-humic soil amendment might have a synergistic effect enhancing their performance. The objective of this study was to examine the effects of HYPAN, two different humic products (HP) (potassium humates from lignite and lignosulfonate), and binary compositions HYPAN-HP on soil properties, microbiological activity, as well as their detoxication ability, and to reveal advantages of binary polymer-humic formulations comparably to individual polymers.In several experimental sets, PE-solutions were applied and examined how they affect soil hydrophysical properties, soil organic matter, and activity of soil microbial community, as well as plant and microbial test-responses in bioassays. A concurrent set of studies involved spiking soil-polymer mixtures with heavy metals (Cu, Zn, Pb, and Cd).Results. Being applied at a soil surface, binary HYPAN-humate formulations formed soil-polymer coatings resistant to the detrimental effects of water and air flows. Being mixed with the entire soil volume, all formulations affected soil aggregate composition differently. Both HP increased the proportion of large fractions, whereas HYPAN alone and in compositions with HP dispersed large soil aggregates and bound small ones, thus increasing the share of valuable 1-0.25 mm aggregates. In contrast, the effects of PE-formulations on soil organic matter were determined by the nature of HP: the one from lignite contributed to the accumulation of condensed aromatic structures, whereas humate from lignosulphonate increased the proportion of low-molecular phenolic compounds. Both HP stimulated the soil microbiological activity, expressed in increased basal respiration, microbial biomass, and metabolic quotient. Binary compositions were more efficient when combined with humate from lignosulphonate.In HM-spiked soil-polymer mixtures, formulations decreased the content of mobile Cu, Zn, Pb, and Cd species and mitigated the toxicity of HM for plants and soil microbial community. A pronounced effect was observed for lignite-originated HP alone and in combinations with HYPAN, but not for HP from lignosulfonate.Conclusions. Combinations of synthetic HYPAN with natural humic biopolymers improved soil hydrophysical properties, stimulated the activity soil microbial community, and mitigated the toxicity of heavy metals in the soil. The effects on soil hydrophysical properties were mainly governed by HYPAN, whereas the effects on soil chemical and biological properties were influenced by humates. The latter effects are determined by the nature and chemical structure of humates. The quality of organic matter in both humates and HYPAN was the primary determinant of the impact of the examined amendments.
Добавил в систему: Якименко Ольга Сергеевна

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