Changes in the Content of Organic Matter in Black soils of Central Ciscaucasia Caused by Their Agricultural Use

Valerii Tshovrebov, Vera Faizova, Dmitry Kalugin, Anastasia Nikiforova, Vera Lysenko
2016 Biosciences Biotechnology Research Asia  
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 %
more » ... or 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.
doi:10.13005/bbra/2026 fatcat:sqf5725sf5bx5fqadcbr7bxdpu