Studying Some Chemical Characteristics of Soil for Physiographic Unites in Wadi El-Sail Alkaber, Taif, Saudi Arabia

Identification of two major physiographic units of the area of Wadi El-Sail Alkaber by using the  geographical  map,  remote  sensing  and  aerial  photographs  colorful:  the  highlands  and  lowlands.  El-Sail Alkaber shall be considered source of material origin and water resources of the territory in the study area  is  covered  with  very  few  desert  shrubs.  Formed  group  the  lowlands  as  a  result  of  settlement processes and sedimentation which includes the units alluvial fan (F), alluvial terraces sediment (T), wadi unit (W), Floodplains unit (P). The study of chemical properties showed that salinity is very low in all soil units. As well as, the sodium adsorption ratio (SAR) and the exchangeable sodium percentage (ESP) werelow. The contents of calcium carbonate were between (0.31 to 34.62%) and the ranges of organic matter content between (0.20 to 0.82%) which consider a very low. The cation exchange capacity was founded between low and medium range (5.37 to 53.89) meq/100g soil. In some soil horizon the cation calcium isdominated. Key  Words:  Wadi  El-Sail  Alkaber  -  Physiographic  Unites  -  Alluvial  fan  units  (F)  -  Alluvial  terraces sediment (T) - Wadi unit (W) - Floodplains unit (P) - Electrical Conductivity (EC) - Organic Matter (OM) - Cation Exchange Capacity (CEC) - Degree of Acidity (pH).