Data/hora: 05/06/2024 00:38:14

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)

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CNPASA - (429-1) - UPC - AP - DD - CNPASA_AP34 -  - 2016.034 - DIS
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