NAGRA Opalinus Clay (…002 - Version 1
FEP 15.1.3 Soils

The soil is the medium which forms the land surface and in which crops grow. Many different factors interact to determine soil type; e.g. geology, climate, vegetation, land-use, relief. Different soil types have characteristic horizons and properties. The top soil layer in agricultural areas is often relatively well mixed (uniform) up to the ploughing depth and is the zone with the highest density of crop roots.