Complex effect of binary polymer-humic compositions on soil properties in model experiment

Gruzdenko, D.; Yakimenko, O.S.

Авторы: Gruzdenko D., Yakimenko O.S.
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: 62
Последняя страница: 62
Аннотация: Land degradation and all related processes affect the entire world and are global social, economic and environmental problems of our time, which are associated with both climate change and anthropogenic human activity. Most often, soil degradation occurs due to the destruction of the upper soil horizons, which are most valuable due to their fertility, as a result of water and wind erosion.One of the approaches to solving this problem is the use of polymer-based stabilizing formulations to obtain protective compositions on the surface of the upper soil horizons. At present, effect of polyelectrolyte-based formulations on soil anti-erosion resistance have been well studied. However, there is insufficient understanding of how these polymers would affect other soil properties.The aim of the study was to assess the influence of three polyelectrolytes and their mixtures on mobility of Cu and Pb, as well as on the aggregate composition of the soil and the effect on phytotoxicity in a model experiment.In this work we used following polyelectrolytes: hydrolyzed polyacrylonitrile (HYPAN), a synthetic polymer, and two commercial humic products: Lignohumate (LH) obtained from lignosulphonate, and humate “Sakhalinsky” (SH) obtained from lignite, as well as binary compositions of HYPAN and humates at ratios 1:1 and 1:2.The model experiment was conducted with the top horizon of cultivated podzolic soil with pH of 6.5, 4% of organic carbon content and light mechanical content. The soil was mixed with solutions of polyelectrolytes giving 0.9% by dry weight. Cu and Pb were applied as nitrate solutions at rates 66;132;198 mg/kg and 64;128;192 mg/kg for Cu and Pb respectively, incubated during two weeks, and content of mobile species of HM was determined.The results showed that HYPAN alone and SH alone, as well as their mixtures, decreased the content of mobile forms of heavy metals in the soil. The LH has no effect on the heavy metal mobile forms amount. The use of polyelectrolytes increased the proportion of agronomically valuable and water-resistant soil aggregates. Determination of the phytotoxicity index showed a decrease in the toxic effect of heavy metals in the treatments with polyelectrolytes and humates compared to the control sample.Conclusions. As soil amendments, binary polymer-humic compositions showed advantages comparably to individual polyelectrolytes. While humates had an impact on soil chemical and biological qualities, HYPAN primarily controlled the impacts on soil hydrophysical parameters, and reduced the mobility of Cu and Pb in soil. In combination, they provided a complex positive effect on soil properties and potential fertility.
Добавил в систему: Якименко Ольга Сергеевна

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