leaching
minerals
topsoil
The soil had a wealth of minerals, trace elements, and rich humus. Some of these deposits are exceedingly rich in a little known substance called fulvic acid.
The soil had a wealth of minerals, trace elements, and rich humus. Some of these deposits are exceedingly rich in a little known substance called fulvic acid.
Humus
very little humus, few minerals
Water, humus, air, living organisms, and minerals
humus
Truly good soil is made up of the following: A proper balance of clay, sand and silt, with a goodly addition of humus (decomposed organic matter). If it has those things, it will automatically have the minerals and tiny microorganisms. Such soil is called "rich loam", and is an ideal growing medium for most things.
Thin Humus layer, minerals deep beneath the surface
Top soil usually has humus and minerals which are often absent from sand, clay or gravel.
fallen rock