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The specific surface area of 60 mineral soil samples estimated by water vapor adsorption at 20 % relative humidity ranged from 12.1 +3.6 to225.1 ±18.4 mVg. Clay (range 1—72 %) and organic carbon content (0.7 —14.6 %) together explained 84 % of the variation in the surface area. The regression equation predicting the specific surface area of soil was surface area (mVg)=2.69+ 1.23c1ay-% +8.690rg.C-%. Index words: water vapor adsorption, relative humidity, mineral soils

Determination of soil specific surface area by water vapor adsorption: II Dependence of soil specific surface area on clay and organic carbon content