Surface soil has good porosity and a fair amount of organic matter.
Below the surface, blocks of granite appear. The space between these blocks is conducive to development of dead vine matter.

Tilled soil:

Sandy loam texture
Water retention: 117,53 mm
Total CEC: 8,3
% organic matter: 2,4

Deep soil:

Sandy loam texture
Water retention: 117,53 mm
Total CEC: 7,3
% organic matter: 0,7

Cation distribution in the CEC (%)

Texture Triangle

Soil texture is defined by the size of the particles making up the soil.