Data/hora: 10/06/2024 18:30:12

Provedor de dados: | 63
País: | Brazil
Título: | Relationship between acidity and chemical properties of brazilian soils
Autores: | Abreu Jr.,Cássio Hamilton; Muraoka,Takashi; Lavorante,André Fernando.
Data: | 2003-01-01
Ano: | 2003
Palavras-chave: | Total acidity; Exchangeable acidity; PH; Aluminum in soil.
Resumo: | In soils of tropical climate regions the high acidity and the presence of exchangeable aluminum (Al3+), associated to low fertility, are the main restrainting factors for agricultural production. A laboratory experiment was conducted using 26 soils of different Brazilian regions, to investigate soil acidity components, giving emphasis to Al and their relations with chemical properties. The pH correlated positively with P, Ca, Mg, K, BS, CEC and V% values, and negatively with Al saturation. The Al3+ was the predominant exchangeable cation in 32% of the soils with pH below 5.6. The KCl titratable H+ represents the hydroxi-Al(OH)x complex with low stability and the Wolf-Morgan extracted Al corresponds to the exchangeable + non-exchangeable Al species. The Al3+ and low stability hydroxi-Al decreased quickly with increasing pH up to 5.5. The non-exchangeable Al increased up to pH 4.5, then decreased to pH 5.5 and had a small increment from 7.0 to 7.5.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200019
Editor: | São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Relação: | 10.1590/S0103-90162003000200019
Formato: | text/html
Fonte: | Scientia Agricola  v.60 n.2 2003
Fonte: | info:eu-repo/semantics/openAccess