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Publication
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| Research Title |
Spatial variability of some important chemical properties of salt-affected soils in Northeast Thailand |
| Date of Distribution |
12 May 2012 |
| Conference |
| Title of the Conference |
the 4th KKU International Engineering Conference 2012 (KKU-IENC 2012) “Driving together towards ASEAN Economic Community” |
| Organiser |
Faculty of Engineering, Khon Kaen University |
| Conference Place |
Khon kaen university |
| Province/State |
khon kaen |
| Conference Date |
10 May 2012 |
| To |
12 May 2012 |
| Proceeding Paper |
| Volume |
4 |
| Issue |
1 |
| Page |
600-605 |
| Editors/edition/publisher |
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| Abstract |
Soil salinity is a major problem in agriculture in northeast Thailand. To cope with this problem, a reliable map of salt-affected soils is essential. The currently used map contains insufficient information because it was made mainly on the basis of the percentage of surface salt crust. Precise information on some important soil chemical properties including electrical conductivity of the saturation extract (ECe) and sodium adsorption ratio (SAR), as well as information on the salt-affected soil types (i.e., saline, sodic, and saline sodic) are undoubtedly required. The objectives of this study were to investigate, in areas of different degrees of salt-affected soils, (1) the variability and spatial correlation of ECe and SAR, and (2) the proportions of different salt-affected soil types. Attention was on the areas with > 50% of salt crusts (class 1), the areas with 10-50% of salt crusts (class 2) and the areas with 1-10% of salt crusts (class 3). Soil samples were taken from areas of every class at 0-15 cm. depth and analyzed for ECe and SAR in the laboratory. For each of these properties, descriptive statistics and geostatistics were applied to elucidate the variability and spatial correlation, respectively. For areas of every class of salt-affected soils, judging from the coefficient of variation (CV), generally the variations of ECe and SAR were very high. According to the geostatistical analyses, the spatial correlation of ECe and SAR were not explicit. Consequently, the proportions of different types of salt-affected soils were assessed in a geographic information system (GIS), using the “inverse distance weighting” (IDW) interpolation method and the “cross” operation available in the ILWIS software. The results revealed that, in areas of class 1 the soils were generally very strongly saline-strongly sodic. The predominant soils in areas of class 2 were normal to very strongly saline-moderately sodic. In areas of class 3, the soils were mainly normal to strongly saline-moderately sodic. Nonetheless, for the areas of classes 2 and 3, other types of salt-affected soils could also be found, but in much less extent. |
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| Peer Review Status |
มีผู้ประเมินอิสระ |
| Level of Conference |
นานาชาติ |
| Type of Proceeding |
Full paper |
| Type of Presentation |
Oral |
| Part of thesis |
true |
| Presentation awarding |
false |
| Attach file |
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| Citation |
0
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Journal Publication
ไทย