Changes In The Content Of Organic Matter In Black Soils Of Central Ciscaucasia Caused By Their Agricultural Use

Valerii Sergeevich Tshovrebov, Vera Ivanovna Faizova, Dmitry Vasilivich Kalugin, Anastasia Mikhailovna Nikiforova, Vera Yaroslavovna Lysenko

Stavropol State Agrarian University 12, Zootechnichesky Pereulok, Stavropol, 355017, Russia

DOI : http://dx.doi.org/10.13005/bbra/2026

ABSTRACT: The research of organic matter content in major subtypes of black soils of the Central Ciscaucasia, namely: ordinary carbonated, ordinary regular (not boiling from the surface), leached and alkalized-firm (similar to vertisols) on virgin and on arable soils, has been performed. It has been found that within 70-100 years of soils exploitation in the system of agrobiocenoses, the content of humus in the upper horizons of soils has reduced by 16-38 % for carbonated, 25 to 33 % for regular, 6-21 % for leached, and 8-24% for alkalized-firm black soil. This trend has not been observed below the illuvial zone. Humic acids contain significantly less fulvic acids, and the humic to fulvic acids ratio (HA:FA) increases in arable soil, as compared to virgin soils from 1.52 to 2.77 for carbonated, from 1.74 to 2.17 for regular and from 1.72 to 2.00 for leached black soils. In alkalized-firm soils, the difference for this indicator has not been detected.

KEYWORDS: organic matter; black soil; Ciscaucasia; humic acids; fulvic acids; virgin soil; tillage

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