| Registro completo |
| Provedor de dados: |
PAB
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| País: |
Brazil
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| Título: |
Degree of phosphorus saturation threshold for minimizing P losses by runoff in cropland soils of Southern Brazil
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| Autores: |
Bortolon,Leandro
Ernani,Paulo Roberto
Bortolon,Elisandra Solange Oliveira
Gianello,Clesio
Almeida,Rodrigo Gabriel Oliveira de
Welter,Samuel
Rogeri,Douglas Antônio
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| Data: |
2016-09-01
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| Ano: |
2016
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| Palavras-chave: |
Eutrophication
Runoff
Single P sorption point
Water quality
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| 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.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901088
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| Editor: |
Embrapa Secretaria de Pesquisa e Desenvolvimento
Pesquisa Agropecuária Brasileira
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| Relação: |
10.1590/s0100-204x2016000900008
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| Formato: |
text/html
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| Fonte: |
Pesquisa Agropecuária Brasileira v.51 n.9 2016
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| Direitos: |
info:eu-repo/semantics/openAccess
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