Data/hora: 12/06/2024 03:01:21

Provedor de dados: | 90
País: | Brazil
Título: | Structural quality of polyacrylamide-treated cohesive soils in the coastal tablelands of Pernambuco
Autores: | Melo,Diego Vandeval Maranhão de; Almeida,Brivaldo Gomes de; Souza,Edivan Rodrigues de; Silva,Laércio Santos; Jacomine,Paulo Klinger Tito.
Data: | 2014-04-01
Ano: | 2014
Palavras-chave: | Anionic polymer; Coagulation/flocculation; Aggregate stability.
Resumo: | Water-soluble polymers are characterized as effective flocculating agents due to their molecular features. Their application to soils with horizons with structural problems, e.g, a cohesive character, contributes to improvements in the physical quality and thus to the agricultural suitability of such soils. The purpose of this study was to evaluate the structural quality of soils with cohesive horizons of coastal tablelands in the State of Pernambuco treated with polyacrylamide (PAM) as chemical soil conditioner. To this end, three horizons (one cohesive and two non-cohesive) of a Yellow Argisol (Ultisol) were evaluated and to compare cohesive horizons, the horizon of a Yellow Latosol (Oxisol) was selected. The treatments consisted of aqueous PAM solutions (12.5; 50.0; 100.0 mg kg-1) and distilled water (control). The structural aspects of the horizons were evaluated by the stability (soil mass retained in five diameter classes), aggregate distribution per size class (mean weight diameter- MWD, geometric mean diameter - GMD) and the magnitude of the changes introduced by PAM by measuring the sensitivity index (Si). Aqueous PAM solutions increased aggregate stability in the largest evaluated diameter class of the cohesive and non-cohesive horizons, resulting in higher MWD and GMD, with highest efficiency of the 100 mg kg-1 solution. The cohesive horizon Bt1 in the Ultisol was most sensitive to the action of PAM, where highest Si values were found, but the structural quality of the BA horizon of the Oxisol was better in terms of stability and aggregate size distribution.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000200012
Editor: | Sociedade Brasileira de Ciência do Solo
Relação: | 10.1590/S0100-06832014000200012
Formato: | text/html
Fonte: | Revista Brasileira de Ciência do Solo  v.38 n.2 2014
Fonte: | info:eu-repo/semantics/openAccess