The Relationship Between Organic Carbon and Ca in the Profile of Luvisols: A Case Study of a Long-Term Experiment in Pulawy, Poland
Dorota Pikuła | Žaneta Pauková | Elżbieta Wójcik-Gront | Vladimír Šimanský
The aim of this study was to determine the impact of multi-year variations in nitrogen fertilisation (N) and farmyard manure application (FYM) in two 4-year crop rotations, A and B&mdash:which differed primarily in terms of their organic matter management systems (A: poor vs. B: enrichment)&mdash:on changes in the content of calcium and soil organic carbon at three soil horizons of Luvisols, and on the dynamics of these changes over the past 40 years. Mineral N fertilisation was found to affect the movement of Ca in the profiles of both rotations. Most Ca accumulated in the soil layer at >:55 cm in the profiles of both rotations. The total Ca content was similar in both rotations: however, a correlation analysis revealed a stronger relationship between organic carbon and Ca in the enriched-cropping system (rotation B) compared to the poor-organic-matter system (rotation A). In the 0&ndash:30 cm soil layer, the correlation coefficient between organic carbon and Ca was r = 0.52 in rotation B, while in rotation A, it was lower at r = 0.23. In deeper layers, this relationship weakened or became non-significant. Under the climatic and soil conditions of Poland, where the phenomenon of nutrient leaching into the soil profile is prevalent, it is extremely important to manage these nutrients in a sustainable way in order to limit their loss. The predominantly sandy texture of the topsoil horizons (0&ndash:30 cm) of the Luvisols prevents any significant enrichment of these horizons in Corg, even over a very long period of time, i.e., more than 40 years.
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