**3.5 Matrix correlation of soil properties**

Pearson's 2-tailed test for soil chemical, physical and ECa correlation showed that shallow ECa has positively significant correlation to pH, EC, CEC, Mg, Fe, clay and deep ECa and negatively significant correlation to Al, fine sand and sand, at 99%. It has positively significant correlation to P, K and total cation, at 95%. The highest r value was 0.70\*\* for deep ECa and followed by pH (r=0.39\*\*). Deep ECa has positively significant correlation to pH, EC, P, CEC, Mg, K, Na, Fe, total cation, clay, fine sand, sand and shallow ECa and negatively significant correlation to Al, at 99%. The highest r value was 0.70 for shallow ECa and followed by Mg (r=0.46\*\*). Eltaib (2003) found that laboratory EC has highest correlation to Mg (r = 0.79\*\*, n = 36) for this study area.
