Soil moisture adsorption capacity and specific surface area in relation to water vapor pressure in arid and tropical soils
| Autor: | Abdelmonem Mohamed Ahmed Amer |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
specific surface
Fen Vapor pressure Science Vapour pressure of water Soil Science Plant Science Environmental Science (miscellaneous) vapor pressure isotherm Water adsorption capacity vapor pressure isotherm soil hydro-physical properties specific surface area arid and tropical soils Arid lcsh:S1-972 Adsorption Water adsorption capacity Loam Specific surface area Environmental chemistry Soil water Environmental science soil hydro-physical properties lcsh:Agriculture (General) Agronomy and Crop Science Water content |
| Zdroj: | Eurasian Journal of Soil Science, Vol 8, Iss 4, Pp 289-297 (2019) Volume: 8, Issue: 4 289-297 Eurasian Journal of Soil Science |
| ISSN: | 2147-4249 |
| DOI: | 10.18393/ejss.580889 |
| Popis: | This study is devoted to predict water vapour adsorption and hydro-physical properties of arid soils in middle Nile Delta (Farm of the Faculty of Agriculture, Shebin El-Kom, Egypt) and of tropical soils ( Felix and INIAP Farms) in Quevedo zone, Los Rios, Ecuador. The vapour pressure and isothermal adsorption of water vapour is used to predict soil moisture adsorption capacity ( Wa ) and the specific surface area. To achieve these objectives, four soil profiles at different depths were investigated to indicate the status of hydro-physical properties of the studied area. The 1 st & 2 nd profiles are sandy loam ( Felix Farm ) and clay loam soils ( Shebin El-Kom Farm ), and 3 rd & 4 th are clay soils ( INIAP Farm) . Data of soil-water adsorption (W%) at different relative vapor pressures P/Po are obtained for the studied soil profiles, where the W% values increased with increasing P/Po from 1.87% to 10.01% in the 1 st and 2 nd sandy loam and clay loam soil profiles, and reached 27.44% in the 4 th clay soil profile. The highest values of water adsorption capacity ( Wa ) were observed in the clay depths of 60 – 90 cm and 90 – 120 cm (INIAP-soil profiles) while the lowest values were in the subsurface depth (30 – 60 cm) of soil profiles 1 st and 2 nd . T he other hygro-physical properties such as adsorbed layers and maximum hygroscopic water were obtained. The specific surface area ( S ) in sandy loam 1 st &2 nd soil profiles is ranged from 113m 2 /g to 187m 2 /g and raised to 385m 2 /g and 553m 2 /g in the 3 rd & 4 th clay soil profiles. The corresponded values of the external specific surface area ( Se ) ranged from 42m 2 /g to 98m 2 /g and 74 m 2 /g to 252 m 2 /g respectively. Two equations were assumed (1) to predict P/Po at water adsorption capacity ( Wa ), and (2) to apply Wa in prediction of soil moisture retention i.e., ѱ(W) function at pF < 4.5. |
| Databáze: | OpenAIRE |
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