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Field-scale Spatial Variability of Electrical Conductivity of the Inland, Salt-affected Soils of Northeast Thailand
| Content Provider | Semantic Scholar |
|---|---|
| Author | Phontusang, Porntip Katawatin, Roengsak Pannangpetch, Krirk Lerdsuwansri, Rattana Kingpaiboon, Sununtha Wongpichet, Kitti |
| Copyright Year | 2017 |
| Abstract | Salt-affected soil maps for Northeast Thailand focus on the percentage of salt crusts. Investigation was done to find the field-scale spatial variability of the electrical conductivity of saturation extract (EC e ) in salt-affected areas (percentage salt crusts: very severely = class 1; severely = class 2, and moderately = class 3). Two study sites were selected for each class (n = 6). Soil samples (n = 100) were collected at each site using stratified, systematic, unaligned sampling, and analyzed for EC e . Variations in EC e were assessed using basic statistics and geostatistics. At the field-scale, in every class, the best-fit semivariogram model generated was satisfactory (R 2 > 0.8). Interpretation from the relevant model parameters (i.e., nugget, sill, and effective range), together with the interpolated (kriged) maps, demonstrated that the characteristics of spatial variability of soil EC e were inconsistent, even between different sites of the same salt-affected soil class. In general, various degrees of small-scale variation were observed, very high variation of EC e was common, spatial dependence was strong to moderate, while the spatial distribution pattern was in distinctive patches. The size of patches depended on the effective range at each site. This study also revealed that the class 1 areas were entirely, very strongly saline (EC e s range, 56.70 and 433.00 dS·m -1 ), whereas the areas of class 3 were non-saline to moderately saline (range, 0.11 - 5.26 dS·m -1 ). Class 2 areas were much more complex; the soils varied from non-saline to very strongly saline (range, 0.16 - 49.00 dS·m -1 ). Information on the nature and characteristics in the spatial variability of soil EC e is useful for developing strategies for management of salt-affected soils in precision agriculture in this region. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://wjst.wu.ac.th/index.php/wjst/article/download/3474/804 |
| Alternate Webpage(s) | https://doi.org/10.14456/vol15iss9pp%25p |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
