Mean-weight diameter of aggregation as affected by initial screen size of two fine-textured soils

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Autor(es): dc.contributorUSDA Agricultural Research Service-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorFranzluebbers, Alan J.-
Autor(es): dc.creatorTanaka, Katiuça Sueko-
Autor(es): dc.creatorMomesso, Letusa-
Autor(es): dc.creatorCalonego, Juliano Carlos-
Autor(es): dc.creatorCrusciol, Carlos Alexandre Costa-
Data de aceite: dc.date.accessioned2025-08-21T17:35:03Z-
Data de disponibilização: dc.date.available2025-08-21T17:35:03Z-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-05-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1002/saj2.20517-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/249796-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/249796-
Descrição: dc.descriptionSoil aggregation is considered a key indicator of soil health to protect soil against erosion, enhance organic C storage, and offer habitat for soil organisms. Various methods to assess aggregation may change interpretations of management, and therefore should be cross-calibrated. We assessed the impact of initial sieve opening size (8 or 4.75 mm) prior to determination of dry-stable and water-stable mean-weight diameter (MWD) from two fine-textured soils—a Rhodic Hapludox from São Paulo, Brazil and a Rhodic Kanhapludult from North Carolina, United States. Both soils were subjected to management expected to alter surface soil conditions. As expected, initial sieving through 8 mm led to greater dry-stable MWD (3.37 ± 0.60 mm) than initial sieving through 4.75 mm (1.94 ± 0.28 mm). However, soil stability index (water-stable MWD/dry-stable MWD) was not affected by initial sieve size opening (0.56 ± 0.13 mm mm−1 under both initial sieve openings). Management interpretations were consistent with both approaches as well, and in particular to detect the strong depth effect on water-stable MWD (i.e., declining with depth). Water-stable macroaggregates had 32% ± 25% greater C concentration than microaggregates; similarly under both initial sieving conditions. Soil stability index when initially sieved through 4.75 mm was highly associated with aggregate stability of 1–2-mm sized dry aggregates, which is a more common procedure. We conclude that passing soil through a screen with 4.75-mm openings to conduct a diversity of soil analyses can be appropriate for obtaining reasonable estimates of and interpretations about surface soil aggregation.-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionUSDA Agricultural Research Service-
Descrição: dc.descriptionDepartment of Crop Science São Paulo State University, São Paulo-
Descrição: dc.descriptionDepartment of Crop Science São Paulo State University, São Paulo-
Descrição: dc.descriptionFAPESP: USDA-ARS-
Formato: dc.format644-655-
Idioma: dc.languageen-
Relação: dc.relationSoil Science Society of America Journal-
???dc.source???: dc.sourceScopus-
Título: dc.titleMean-weight diameter of aggregation as affected by initial screen size of two fine-textured soils-
Tipo de arquivo: dc.typelivro digital-
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