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• W2001460817 abstract "In temperate regions, the adoption of no-tillage (NT) often stimulates the sequestration of soil C and N and improves soil structural stability. The aim of this study was to investigate if NT has similar impacts on the stability of water-stable aggregates and C and N stabilization in two Oxisols (Typic Haplorthox) under different crop rotations. Slaking-resistant aggregates were isolated by wet sieving and analyzed for C and N concentrations at two agricultural experiment sites (Passo Fundo and Londrina) in southern Brazil. At both sites, the total organic C and N in the 0- to 5-cm depth interval, decreased in order native vegetation (NV) > NT > conventional tillage (CT). The mean weight diameter (MWD) of the aggregates was on average 0.5 mm greater under NT compared with CT, and was also greater (approximately 0.2 mm) under more diverse rotations, which included a leguminous green-manure crop, in comparison with continuous wheat (Triticum aestivum)–soybean (Glycine Max L.). The aggregate-size distribution was dominated (60–90%) by macroaggregates (>250 μm). At both sites, CT decreased the proportion of the largest macroaggregate class (>2000 μm) by approximately 10% in comparison with NT management, and there was a corresponding increase in the proportion of the 53- to 250-μm aggregate class. In the 0- to 5-cm soil layer of both sites, the C and N concentrations were significantly higher in the macroaggregates of the NT than of the CT systems. The lack of differences in C, N content, and C/N ratio across aggregate-size classes indicated that these soils dominated by 1:1 clays and Fe/Al oxides do not express an aggregate hierarchy and that an increase in aggregation does not explain the increase in C and N under NT. In conclusion, CT decreased aggregation similarly in Oxisols as in temperate soils, but this decrease does not explain the loss of C and N because the tight feedback between soil organic matter (SOM) and aggregate stability (i.e., SOM being a major binding agent) observed for temperate soils was not found for Oxisols." @default.
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• W2001460817 date "2005-03-01" @default.
• W2001460817 modified "2023-10-06" @default.
• W2001460817 title "Impact of Tillage and Crop Rotation on Aggregate-Associated Carbon in Two Oxisols" @default.
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• W2001460817 doi "https://doi.org/10.2136/sssaj2005.0482" @default.
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