Data/hora: 28/05/2024 05:47:33

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