Effects of humus compounds stabilization by influence of bentonite rock as criteria for environmental sustainability of sod-podsolic soil agroecosystems
The article contains an analysis of physical and chemical changes in system of “humus substances – bentonite”,
which occurred in sludge and colloidal fractions of sod-podsolic light loamy soil during 3 years of interaction with bentonite
clay (Zyryan deposit) in the conditions of the agroecosystem (northern subzone of forests, Nizhny Novgorod region). The
3-year microfield experiment (2015–2017) has been conducted on the territory of Elitkhoz LLC in the Borsky municipal
district. Bentonite was added to the divisions (accounting area of each is 1 m2
) during July of 2014 in doses at rate of
3, 6 and 12 ton/ha, on which varieties of winter wheat, barley and seed peas adapted for the Volga-Viatka region were grown. Infrared analysis of soil colloidal component showed presence of new silicon-containing organomineral complexes
in studied samples, and identified types of chemical compounds directly indicate participation of silicon in their formation.
The use of bentonite contributed to preservation of natural content of humus in soil, which can also confirm presence of
silicon substances interaction of the rock (mono- and polysilicic acids, silicic-oxygen packets) with the organic part and,
as a result, to keep it from mineralization. The physicochemical effects of silicon substances imteraction with organic
substance of soil-absorbing complex described in work, leading to strengthening of elementary humus particles and
increasing their resistance to degradation, can be regarded as criteria for environmental stability of podzolic agrosoils
under conditions of using bentonites as meliorants of complex stabilizing effect.
Keywords: sod-podsolic light loamy soil, bentonite clay, spectroscopic infrared analysis, sludge and colloidal soil fractions, silicon-containing reaction-active centers, stabilization of organic substance, ecological stability of agroecosystem
Article published in number 1 for 2021 DOI: 10.25750/1995-4301-2021-1-133-138
ISSN 1995-4301
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