## 4 Results
### Soil Salinity Severity Classification and Soil Texture  
Based on soil series data of LDD in 2011 [68], soil textures and other areas in the study area are composed of loamy sand, sandy loam, silt loam, silty clay, and clay with a salt farm, urban areas, and water bodies. The result of overlay analysis between soil salinity severity classification of two measuring modes and soil texture is reported in Table 20.  
In Table 19, it can be seen that the most dominant soil salinity severity classification of two measuring modes over two main geologic units, the Maha Sarakham formation and Quaternary sediments, are strongly and very strongly saline classes. They cover areas in the HH and VV modes, about 81.48% and 89.62%, respectively.  
### Soil Salinity Severity Classification and Soil Texture  
Based on soil series data of LDD in 2011 [68], soil textures and other areas in the study area are composed of loamy sand, sandy loam, silt loam, silty clay, and clay with a salt farm, urban areas, and water bodies. The result of overlay analysis between soil salinity severity classification of two measuring modes and soil texture is reported in Table 20.  
\begin{table}
\begin{tabular}{l c c c c c} \hline \hline \multirow{2}{*}{**Soil Texture/**} & \multicolumn{4}{c}{**Soil Salinity Severity Class**} \\ \cline{2-6}  & **Non-Saline** & **Slightly Saline** & **Moderately Saline** & **Strongly Saline** & **Very Strongly Saline** \\ \hline \hline \multirow{4}{*}{**Other Areas**} & \multirow{4}{*}{**Non-Saline**} & \multirow{4}{*}{**Slightly Saline**} & **Moderately Saline** & **Strongly Saline** & **Saling** \\  & & & & & \\ \cline{1-1} \cline{6-6}  & & & & & \\ \cline{1-1} \cline{6-6}  & & & & & \\ \hline \hline \end{tabular}
\end{table}
Table 20: Area of soil texture and soil salinity severity classification in the two measuring modes.  
\begin{table}
\begin{tabular}{l c c c c c} \hline \hline \multirow{2}{*}{**Soil Salinity Severity Class**} & \multicolumn{4}{c}{**Geologic Unit**} \\ \cline{2-5}  & \multicolumn{2}{c}{**Maha Sarakham Formation**} & \multicolumn{2}{c}{**Quaternary Sediments**} \\ \cline{2-5}  & **Area in sq. km.** & **Percent** & **Area in sq. km.** & **Percent** \\ \hline \hline \multicolumn{5}{c}{**HH measuring mode**} \\ \hline Non-saline & 2.06 & 0.38 & 9.21 & 1.68 \\ Slightly saline & 2.91 & 0.53 & 9.64 & 1.76 \\ Moderately saline & 31.04 & 5.68 & 46.37 & 8.48 \\ Strongly saline & 74.29 & 13.59 & 109.34 & 20.00 \\ Very strongly saline & 38.59 & 7.06 & 223.20 & 40.83 \\ Total & 148.88 & 27.24 & 397.75 & 72.76 \\ \hline \hline \end{tabular}
\end{table}
Table 19: Area and percentage of the geologic unit and soil salinity severity classification in the two measuring modes.  
In Table 20, for the result of the HH measuring mode, the top three dominant soil textures in the slightly saline and moderately saline classes are sandy loam, silty clay, and clay; they cover about 29.27, 25.14, and 11.81 sq. km, respectively. Meanwhile, the top three dominant soil textures in the strongly saline and very strongly saline classes are sandy loam, silty clay, and loamy sand, which cover about 254.79, 66.04, and 41.77 sq. km, respectively.  
For the result of the VV measuring mode, the top three dominant soil textures in the slightly saline and moderately saline classes are sandy loam, silty clay, and silt loam. They cover about 20.94, 16.95, and 7.21 sq. km, respectively. In contrast, the top three dominant soil textures in the strongly saline and very strongly saline classes are sandy loam, silty clay, and loamy sand. They cover 271.03, 74.23, and 44.89 sq. km, respectively.