Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/10653
Título: Complexo de troca, classificação e gestão dos solos ferralíticos de Angola
Outros títulos: Exchangeable complex and taxonomy and management of ferrallitic soils from Angola
Autor: Madeira, Manuel
Ricardo, Rui Pinto
Palavras-chave: ammonium acetate method
cation exchange capacity
ferralic horizon
Mehlich method
Data: 2015
Editora: SCAP
Citação: "Revista de Ciências Agrárias". ISSN 0871-018X. 38(3) (2015) 390-406
Resumo: The cation exchange capacity, sum of exchangeable bases, and saturation base degree of Ferralitic soils from the Republic of Angola, determined by the Mehlich and ammonium acetate methods, were compared to update their taxonomy; also, the exchangeable acidity was determined for deeper insight in their classification. Fourty eight representative pedons of subordens of those soils (Tipoferralic, Weakly Ferralic and Psamoferralic) were analysed. Values of sum bases and exchangeable Ca2+ and Mg2+ by the two methods were strongly correlated; cation exchange capacity, base saturation degree and exchangeable K+ showed weaker and variable correlations, according to soil type. Exchangeable acidity largely corresponded to Al3+, but its content was mostly less than one cmolc kg-1; its percentage regarding the effective cation exchange capacity was mostly higher than 60%. Study soils show in overall subsurface horizons with the characteristics of a ferralic horizon; therefore, they are mostly Ferralsols, which can be separated at first level in geric, vetic e haplic Ferralsols, according to the effective cation exchange capacity value; also, at second level they are largely dystric and, in great proportion, alumic. The weakness of study soils regarding the low nutrient retention capacity can be alleviated by organic matter additions and liming
URI: http://hdl.handle.net/10400.5/10653
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