Data/hora: 05/06/2024 18:08:37

Biblioteca(s): 	Embrapa Pesca e Aquicultura; Embrapa Solos / UEP-Recife; Embrapa Unidades Centrais.	
Data corrente: 	14/11/2016	
Data da última atualização: 	17/11/2016	
Autoria: 	BORTOLON, L.; ERNANI, P. R.; BORTOLON, E. S. O.; GIANELO, C.; ALMEIDA, R. G. O. de; WELTER, S.; ROGERI, D. A.	
Afiliação: 	LEANDRO BORTOLON, CNPASA; PAULO ROBERTO ERNANI, UESC; ELISANDRA SOLANGE OLIVEIRA BORTOLON, CNPASA; CLESIO GIANELLO, UFRGS; RODRIGO GABRIEL OLIVEIRA DE ALMEIDA, UFRGS; SAMUEL WELTER, UFRGS; DOUGLAS ANTONIO ROGERI, Faculdade de Itapiranga.	
Título: 	Degree of phosphorus saturation threshold for minimizing P losses by runoff in cropland soil of Southern Brazil.	
Ano de publicação: 	2016	
Fonte/Imprenta: 	Pesquisa Agropecuária Brasileira, Brasília, DF, v. 51, n. 9, p. 1088-1098, set. 2016.	
Idioma: 	Inglês	
Conteúdo: 	The objective of this work was to assess the risk of phosphorus losses by runoff through an index based on the degree of P saturation (DPS), in cropland soils of Southern Brazil. Sixty-five highly representative cropland soils from the region were evaluated. Three labile P forms were measured (Mehlich-1, Mehlich-3, and ammonium oxalate), and four P sorption indexes were tested (phosphorus single sorption point and Fe+Al determined with the three extractors). Water-extractable P (WEP) was used as an index of P susceptibility to losses by surface runoff. The DPS was determined from the ratio between labile P and each sorption index. DPS values obtained from the ratio between Mehlich-1 P and the single P sorption point ranged from 1 to 25%, whereas those from Mehlich-1 P and Fe+Al (ammonium oxalate) ranged from 1 to 55%. All DPS types were highly correlated with WEP. From a practical stand point, the DPS obtained with both P and Fe+Al extracted with Mehlich-1 can be used to estimate the risk of P losses by runoff in soils of Southern Brazil.	
Palavras-Chave: 	Escorrimento superficial; P em único ponto; Qualidade de água; Single P sorption point.	
Thesagro: 	Eutrofização.	
Thesaurus Nal: 	Eutrophication; Runoff; Water quality.	
Categoria do assunto: 	--	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/150006/1/Degree-of-phosphorus-saturation.pdf	
Registro original: 	Embrapa Pesca e Aquicultura (CNPASA)	
Exemplares: 	AI-SEDE - (60166-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS
CNPASA - (429-1) - UPC - AP - DD - CNPASA_AP34 -  - 2016.034 - DIS
CNPS-UEPR - (2986-1) - ADD - AP - DD - 630.72081 - B739d - 2017.03508 - DIS