Data/hora: 22/06/2024 11:01:20

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: | --
Registro original: | Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)
Exemplares: | CPAMN-UEPP - (5049-1) - ADC - SP - -- -  -  - 1993.04845 - DIS