Data/hora: 11/06/2024 17:24:07

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 16/09/2013
Data da última atualização: | 19/02/2015
Autoria: | MORALES, M. M.; COMERFORD, N.; GUERRINI, I. A.; FALCÃO, N. P. S.; REEVES, J. B.
Afiliação: | MARINA MOURA MORALES, CNPF; UNIVERSITY OF FLORIDA; UNESP; INPA; ENVIRONMENTAL MANAGEMENT AND BYPRODUCTS UTILIZATION LAB.
Título: | Sorption and desorption of phosphate on biochar and biocha-soil mixtures.
Ano de publicação: | 2013
Fonte/Imprenta: | Soil Use and Management, v. 29, p. 306-314, Sept. 2013.
Idioma: | Inglês
Conteúdo: | The term biochar refers to materials with diverse chemical, physical and physicochemical characteristics that have potential as a soil amendment. The purpose of this study was to investigate the P sorption/desorption properties of various slow biochars and one fast pyrolysis biochar and to determine how a fast pyrolysis biochar influences these properties in a degraded tropical soil. The fast pyrolysis biochar was a mixture of three separate biochars: sawdust, elephant grass and sugar cane leaves. Three other biochars were made by slow pyrolysis from three Amazonian tree species (Lacre, Inga and Embauba) at three temperatures of formation (400 °C, 500 °C, 600 °C). Inorganic P was added to develop sorption curves and then desorbed to develop desorption curves for all biochar situations. For the slow pyrolysis, the 600 ºC biochar had a reduced capacity to sorb P (4–10 times less) relative to those biochars formed at 400 °C and 500 °C. Conversely, biochar from Inga desorbed the most P. The fast pyrolysis biochar, when mixed with degraded tropical mineral soil, decreased the soil’s P sorption capacity by 55% presumably because of the high soluble, inorganic P prevalent in this biochar (909 mg P/kg of biochar). Phosphorus desorption from the fast pyrolysis biochar/soil mixture not only exhibited a common desorption curve but also buffered the soil solution at a value of ca. 0.2 mg/L. This study shows the diversity in P chemistry that can be expected when biochar is a soil amendment and suggests the potential to develop biochars with properties to meet specific objectives.
Palavras-Chave: | Biocarvão.
Thesagro: | Fósforo.
Thesaurus Nal: | biochar; desorption; phosphorus; sorption.
Categoria do assunto: | --
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (51134-1) - UPC - AP - DD -  -  -  - DIS