Citation
Shamshuddin Jusoh, . and Ruziah Salleh, . and Ahmad Husni M.H., . and Kamis Awang, . The minerology and chemical properties of soils on granite gneiss in three climatic zones in Sri Lanka. pp. 57-61. ISSN 0126-6128
Abstract
Granite gneiss occurs sporadically throughout Sri Lanka. Depending on the climatic conditions and topography of the area the rock undergoes different degrees of chemical weathering. The mineralogy and chemical properties of four common granite gneiss soils occuring in three agro-ecological zones in Sri Lanka were studied. The soil in the wet zone is low in pH and basic exchangeable cations while the soils in the wet zone are high in pH and basic exchangeable cations. The colour of the soils changes from yellowish-brown to red as the soils get drier presumably due to the presence of haematite and/or goethite. Kaolinite halloysite and smectite are present in all the soils irrespective of the climatic conditions; the amount of halloysite decreases towards the surface. Biotite is abundant in the soil of the intermediate and dry zones but is absent in the soil of the wet zone. Gibbsite is present in the highly weathered soil of the wet zone. The concentration of Ca in soil solution is dependent on the amount in the soils existing in the form of exchangeable Ca. Additionally the solution Ca concentration is significantly correlated with the soil ECEC and te ECEC/CEC ratio.
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Abstract
Granite gneiss occurs sporadically throughout Sri Lanka. Depending on the climatic conditions and topography of the area the rock undergoes different degrees of chemical weathering. The mineralogy and chemical properties of four common granite gneiss soils occuring in three agro-ecological zones in Sri Lanka were studied. The soil in the wet zone is low in pH and basic exchangeable cations while the soils in the wet zone are high in pH and basic exchangeable cations. The colour of the soils changes from yellowish-brown to red as the soils get drier presumably due to the presence of haematite and/or goethite. Kaolinite halloysite and smectite are present in all the soils irrespective of the climatic conditions; the amount of halloysite decreases towards the surface. Biotite is abundant in the soil of the intermediate and dry zones but is absent in the soil of the wet zone. Gibbsite is present in the highly weathered soil of the wet zone. The concentration of Ca in soil solution is dependent on the amount in the soils existing in the form of exchangeable Ca. Additionally the solution Ca concentration is significantly correlated with the soil ECEC and te ECEC/CEC ratio.
Additional Metadata
Item Type: | Article |
---|---|
Additional Information: | Summaries (En Ms) |
AGROVOC Term: | SUELO DE GRANITO |
AGROVOC Term: | SOLUCIONES DEL SUELO |
AGROVOC Term: | PH DEL SUELO |
AGROVOC Term: | PROPIEDADES FISICO-QUIMICAS SUELO |
AGROVOC Term: | MINERALOGIA |
AGROVOC Term: | ZONAS CLIMATICAS |
AGROVOC Term: | TIPOS CLIMATICOS DE SUELOS |
AGROVOC Term: | SRI LANKA |
Depositing User: | Ms. Norfaezah Khomsan |
Last Modified: | 24 Apr 2025 05:52 |
URI: | http://webagris.upm.edu.my/id/eprint/17329 |
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