Distribution of electrical conductivity values of Kamphang Saen soil series
1992
Anuwat Pothinam
Soil samples were taken in a 100x100 m grid for a total of 127 sites and at the depths of 0-5 and 25-30 cm in both dry and rainy seasons. Both parameters are analyzed by geostatistical methods and variograms are obtained. Using ordinary kriging analysis, the resulting contour maps show details at the 50X50 m grid. Location of high salt remain fixed in both layers and seasons, indicating the existence of salt layers in the profile. There is no relationship between the electrical conductivity of saturation extract (ECe) and soil water content values over the whole area. However, ECe related strongly to EC1:5, which was measured using 1:5 soil:water extract, i.e. ECe=0.53+6.58 EC1:5, with the unit of ECe as dS m** (-1), ECe also relates strongly to the sodium adsorption ratio. The study of ground water at the 24 sites within this area shows that high water level occurs surrounding the reservoir and along the irrigation ditch. Ground water flows in the direction of west to east. High ground water is associated with low EC of the water due to dilution effect, whereas deep water level has high EC. High ground water, however, helps bring salt to soil suface.
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