The Influence of Freeze–Thaw Processes and the Organic Supplementation on the Structural Parameters of Luvisol

From an agronomic perspective, the most important property of soil aggregates is their stability. The stability of the soil structure can vary greatly, even over a short time. In this context many authors draw attention to the influence that climatic factors have on the stability of aggregates. The process of freeze–thaw cycles (FTC) could result in changes in the aggregates’ stability. The research objective was to determine the effect of alternating freeze–thaw cycles on selected parameters of soil structure in Luvisol depending on the type and duration of action of organic supplementation. Cyclic freeze–thaw (FT) processes significantly modified most of the analysed properties of soil aggregates. This effect was usually not modified by organic supplementation, nor by its duration of action. FT cycles reduced the density of soil aggregates. FT cycles reduced the resistance of soil aggregates to dynamic and static water action. Despite the lower resistance to the destructive action of water, the decomposition of primary aggregates resulted in a more favourable size distribution of secondary aggregates in aggregates subjected to FT cycles. The research objective was to determine the effect of alternating freeze–thaw cycles on selected parameters of soil structure in Luvisol depending on the type and duration of action of organic supplementation.