Data/hora: 06/06/2024 00:53:30

Provedor de dados: 	86	
País: 	Brazil	
Título: 	Degree of phosphorus saturation threshold for minimizing P losses by runoff in cropland soils of Southern Brazil	
Autores: 	Bortolon,Leandro; Ernani,Paulo Roberto; Bortolon,Elisandra Solange Oliveira; Gianello,Clesio; Almeida,Rodrigo Gabriel Oliveira de; Welter,Samuel; Rogeri,Douglas Antônio.	
Data: 	2016-09-01	
Ano: 	2016	
Palavras-chave: 	Eutrophication; Runoff; Single P sorption point; Water quality.	
Resumo: 	Abstract 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.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901088	
Editor: 	Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira	
Relação: 	10.1590/s0100-204x2016000900008	
Formato: 	text/html	
Fonte: 	Pesquisa Agropecuária Brasileira  v.51 n.9 2016	
Fonte: 	info:eu-repo/semantics/openAccess