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Registro Completo |
Biblioteca(s): |
Embrapa Meio Norte / UEP-Parnaíba. |
Data corrente: |
15/02/1996 |
Data da última atualização: |
15/02/1996 |
Autoria: |
SHAW, R. J.; THORBURN, P. J. |
Afiliação: |
Queensland Department of Primary Industries. |
Título: |
Prediction of leaching fraction from soil properties, irrigation water and rainfall. |
Ano de publicação: |
1985 |
Fonte/Imprenta: |
Irrigation Science, v.6, p.73-83, 1985. |
Idioma: |
Inglês |
Conteúdo: |
Fine textured soils (> 40% clay) form a major proportion of irrigated soils in northeastern Australia. More than half these soils are irrigated with groundwater, some of which has high salinity (electrical conductivity > 2.9 mS cm-1). A simple prediction of salt leaching was sought to aid in land management decisions. An empirical model of leaching fraction is presented based on rainfall and easily measured soil properties related to hydraulic conductivity. The model is based on data from 766 soils. To account for the complexity of interactions between soil properties, the data was stratified into groups based on clay content and mineralogy (expressed here as CEC/clay ratio). This allowed simple linear regressions using ESP and rainfall to be developed topredict leaching fraction. When applied to irrigated soils, a salinity correction term (EC rain + irrigation/ EC rain) was used to account for the flocculation effects of the increased salinity of irrigation waters. The model gave good predictions of leaching fraction for two irrigation regions with widely differing soil properties (Fig. 4). |
Palavras-Chave: |
Lixiviacao de sais; Precipitacao; Rainfall; Salt leaching; Sodio trocavel. |
Thesagro: |
Irrigação; Lixiviação; Salinidade. |
Thesaurus Nal: |
exchangeable sodium; irrigation; leaching; salinity. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01836naa a2200277 a 4500 001 1076018 005 1996-02-15 008 1985 bl --- 0-- u #d 100 1 $aSHAW, R. J. 245 $aPrediction of leaching fraction from soil properties, irrigation water and rainfall. 260 $c1985 520 $aFine textured soils (> 40% clay) form a major proportion of irrigated soils in northeastern Australia. More than half these soils are irrigated with groundwater, some of which has high salinity (electrical conductivity > 2.9 mS cm-1). A simple prediction of salt leaching was sought to aid in land management decisions. An empirical model of leaching fraction is presented based on rainfall and easily measured soil properties related to hydraulic conductivity. The model is based on data from 766 soils. To account for the complexity of interactions between soil properties, the data was stratified into groups based on clay content and mineralogy (expressed here as CEC/clay ratio). This allowed simple linear regressions using ESP and rainfall to be developed topredict leaching fraction. When applied to irrigated soils, a salinity correction term (EC rain + irrigation/ EC rain) was used to account for the flocculation effects of the increased salinity of irrigation waters. The model gave good predictions of leaching fraction for two irrigation regions with widely differing soil properties (Fig. 4). 650 $aexchangeable sodium 650 $airrigation 650 $aleaching 650 $asalinity 650 $aIrrigação 650 $aLixiviação 650 $aSalinidade 653 $aLixiviacao de sais 653 $aPrecipitacao 653 $aRainfall 653 $aSalt leaching 653 $aSodio trocavel 700 1 $aTHORBURN, P. J. 773 $tIrrigation Science$gv.6, p.73-83, 1985.
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Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP) |
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1. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | SINGELS, A.; JONES, M.; MARIN, F.; RUANE, A.; THORBURN, P. Predicting climate change impacts on sugarcane production at sites in Australia, Brazil and South Africa using the Canegro model. Sugar Tech, New Delhi, v. 16, n. 4, p. 347-355, Oct./Dec. 2014.Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 2 |
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