Re: what is the diffrence between inorganic and organic soil?

A soil scientist defines an organic soil as one that contains 20% or more 
organic matter (by dry weight). An inorganic soil would then contain less than 
20% organic matter and the rest a mixture of sand, silt and clay particles made 
of various minerals. 

Organic soils are often made from drained peat bogs or swamps and may be very 
productive agricultural soils when fertilized properly. South central Florida 
has a large area of organic soil as does northern Minnesota and Mississippi 
Delta. Organic soils occur more locally in many other humid areas.  

Potting soils often are mainly organic as well.