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CLAY AMELIORATION OF SOD-PODZOLIC SOILS WITH LIGHT COMPOSITION AS A FACTOR OF THEIR PH-BUFFER CHANGES

Abstract

The aim is to investigate the effect of clay on the pH-buffer of sod-podzolic soils of light composition (cohesive and sandy loam). Emission-spectral, petrographic and thermal analysis applied in clay studies showed its high ameliorative qualities. It was determined that the introduction of clay into sod-podzolic soils of co-sandy and sandy-loam composition, as well as spreading over the surface with its further plowing into the arable layer, and locally by bands (clay mixed with soil) into the upper part of the subsoil layer promoted an increase in the content in the soils of physical clay. The increase in the content of physical clay in the local zones was noted especially, although the rates of application of clay itself to the soil were 5 times less than in the case of its traditional application in a random manner. Calculations show that the concentration of applied clay per kilogram of soil, in the doses given above, is 3,3-3,4 times higher for local application than for traditional application. Clay soil with the use of local technology significantly improves the acid-base regime in the soil. In local pH zones, the water content was 5,9-6,0 units, and already in the soil adjacent to it, this index decreases to 5,7-5,8 pH units. As the distance from local zones increases, the acidity of the soil increases, reaching the pH of the soil itself, namely, 5,3-5,4. The increase in buffer capacities in the alkaline and acid load ranges in the series is established: control clay 50 t/ha (spreading) clay 10 t/ha (locally). That is, there is an obvious regularity in the dependence of the acid-alkaline buffer of the investigated soil on the amount of clay particles in a unit of soil mass. Positive changes in the pH-buffer of sod-podzolic soils of light composition under the influence of claying indicate an improvement in the functioning of soil buffer mechanisms.

About the Authors

Yu. L. Tsapko
National Science Center «Institute for Soil Science and Agrochemistry Research named after O.N. Sokolovsky» NAAS of Ukraine
Ukraine


A. I. Ohorodnia
National Science Center «Institute for Soil Science and Agrochemistry Research named after O.N. Sokolovsky» NAAS of Ukraine
Ukraine


Radvan Bakhaa Meshref
National Science Center «Institute for Soil Science and Agrochemistry Research named after O.N. Sokolovsky» NAAS of Ukraine
Ukraine


A. S. Kholodna
National Science Center «Institute for Soil Science and Agrochemistry Research named after O.N. Sokolovsky» NAAS of Ukraine
Ukraine


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For citations:


Tsapko Yu.L., Ohorodnia A.I., Meshref R.B., Kholodna A.S. CLAY AMELIORATION OF SOD-PODZOLIC SOILS WITH LIGHT COMPOSITION AS A FACTOR OF THEIR PH-BUFFER CHANGES. Soil Science and Agrichemistry. 2018;(2):67-77. (In Russ.)

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ISSN 1999-740X (Print)
ISSN 2959-3433 (Online)