1. A STUDY ON SHALLOW SOIL PROPERTIES AND WATER QUALITIES OF SALINE SOIL AREA IN AMPHOE THATPANOM AND RENU-NAKHON, NAKHON PANOM PROVINCE Uma Seeboonruang, KMITL

2. Problem Statement

3. Project Objectives Indicate t he salinity distribution both in soil and surface water. Indicate t he salinity distribution both in soil and surface water. Establish the relationship between soil salinity and other soil and groundwater properties. Establish the relationship between soil salinity and other soil and groundwater properties.

4. Study Area

5. Methodology Data Collection Profile Soil Sampling Surface & Ground Water Sampling Sampling Location Determinations

6. Soil Experiments In-situ measurement Physical Properties Chemical Properties Chemical Properties Simple & Multiple Linear Regression Salinity Prediction Model

7. Results : Soil Salinity Below 138 m.msl. Din DamPak BangKok SawangPimanKhon KongW. Sawang

8. Above 138 m.msl. Dong Ma Eak Bo Dok SornPra Song Noi Nam Bo Chan TaDong Ma Eak

9. Results : Groundwater Salinity

10. Results: Surface water salinity

12. Analysis: Simple Linear Regression

14. Analysis: Multiple Linear Regression Independent Parameters Soil specific gravity Groundwater TDS Liquid limit Water content Relative depth #200 passing Dependent Parameter Soil TDS

17. Soil TDS = 23.699 - 576.969 GS + 33.429 LL - 65.100 Rel. Depth + 0.046 GW TDS Salinity = 0.797 TDS - 19.257

18. Summary Soil salinity is found in the area located above the 138 m.msl. and none is found in the area below the contour line. Soil salinity is found in the area located above the 138 m.msl. and none is found in the area below the contour line. Highest salinity is found at Bo Dok Sorn and Pra Song Noi. Highest salinity is found at Bo Dok Sorn and Pra Song Noi. Salinity is found in the surface water nearby Dong Ma Eak, but little in the soil and groundawter. Salinity is found in the surface water nearby Dong Ma Eak, but little in the soil and groundawter.

19. Summary (continued) No apparent relationship between soil salinity and other parameters when analyzed by simple linear regression. No apparent relationship between soil salinity and other parameters when analyzed by simple linear regression. Increases in groundwater salinity and liquid limit may have an influence on soil salinity. Increases in groundwater salinity and liquid limit may have an influence on soil salinity. Soil specific gravity, groundwater TDS, liquid limit, water content, and relative depth are found to correlate with soil salinity Soil specific gravity, groundwater TDS, liquid limit, water content, and relative depth are found to correlate with soil salinity

20. Future Research Additional soil and water sampling and testings. Additional soil and water sampling and testings. Shallow groundwater flow direction and salinity distribution. Shallow groundwater flow direction and salinity distribution. Agricultural practices. Agricultural practices.

21. Acknowledgement Research Support Budget Fiscal year 2006 of Faculty of Engineering, King Mongkuts Institute of Technology Ladkrabang, Thailand

22. Din Dam Khon Kong Piman Kok Sawang Wat Sawang Pak Bang Pra Song Noi Bo Dok Sorn Nam Bo Chan Ta Dong Ma Eak