Change in the humus state of typical chernozem with various methods of tillage
https://doi.org/10.32634/0869-8155-2024-378-1-92-96
Abstract
Relevance. The article is devoted to the influence of various methods of tillage on the humus state of typical chernozem (Haplic Chernozems).
Methods. Tillage options: plowing with a formation turnover (20–22 cm); combined processing (disking 8–10 cm + chisel 20–22 cm); surface treatment (disking) up to 8 cm; direct sowing. The object of the study was a typical powerful heavy loamy chernozem.
Results. According to the results of the group and fractional composition of typical chernozem humus (regardless of the method of processing and the studied soil layer), the following patterns were established: the predominance of a group of humic acids (HA — 45–55% of organic carbon (Sorg.), a high proportion of humic acids associated with calcium (HA-2 — 29–41% of Sorg.), low content of non-hydrolyzable residue (NO — 29–36% of Sorg.), humate type of humus (Sgc:Sfk > 2), a very high degree of humification of organic matter (>4.5). With an increase in the depth of the arable layer (regardless of the method of tillage), there is an increase in Sgc, Sgc-2 and a decrease in carbon of humic acids free and associated with mobile oneand-a-half R2O3 (Sgc-1), carbon of humic acids associated with stable R2O3 (Sgc-3), and carbon of fulvic acids (Sfk). In the 0-20 cm layer, the predominance of Sgc-1 (5.5%) is noted, and their content decreases depending on the method of tillage in the series “combined (5.08%) → surface treatment → direct sowing (4.91)”. When applying an extreme degree of minimization (direct sowing) in a layer of 0–20 cm in relation to other methods of tillage, the largest amount of Sgk-2 is noted. The content of Sgk-3 and Sfk was highest with surface and combined treatment.
Keywords
typicalchernozem (Haplic Chernozems),
methods of tillage,
organic carbon,
fractional and group composition of humus
Supporting agencies: The materials were prepared with the support of the Ministry of Education and Science of the Russian Federation within the framework of the state assignment of the Federal State Budgetary Scientific Institution of the Kursk Federal Agrarian Scientific Center (topic No. FGZU-2019-0002)
About the Authors
E. V. Dubovik
Federal Agricultural Kursk Research Center
Russian Federation
Russian Federation
Elena V. Dubovik, Doctor of Biological Sciences
70B Karl Marx Str., Kursk, 305021
D. V. Dubovik
Federal Agricultural Kursk Research Center
Russian Federation
Russian Federation
Dmitry V. Dubovik, Doctor of Agricultural Sciences, Professor of the Russian Academy of Sciences
70B Karl Marx Str., Kursk, 305021
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Review
For citations:
Dubovik E.V., Dubovik D.V. Change in the humus state of typical chernozem with various methods of tillage. Agrarian science. 2024;(1):92-96. (In Russ.) https://doi.org/10.32634/0869-8155-2024-378-1-92-96
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