As the clay content increases, there is more surface area in the soil for organic matter to adsorb to, which decreases the rate of decomposition.
one major difference between humus and clay soil is that humus is made up of remains of dead plants and animals and it is topmost layer of the soil whereas clay soil is a type of soil which is used to make earthen pots or clayey toys etc.
Humus is a very rich, composted material, such as manure, leaves, kitchen scraps, etc. It is added to soil to increase the nutrient content of the soil as well as improve the makeup of the soil (sand, loam or clay) it is too rich for direct planting of most plants though.
As Loam soil has almost equal proportions of sand, silt & clay the bacterial activity is very high. Hence bacterial activity is highly predominant in loam soil. So humus content may be high in loamy soil than clay which has high organic content but poor aeration due to which bacterial activity is low.
clay
black
First, the lightest soil component is clay. The, there's sand then humus then finally gravel.
Humus
25%-sand 255-clay 25%-gravel 25%-humus
sand, clay, rocks, humus, slit.
Black soil has the maximum content and is extremely fertile.
niether, it becomes humus
its exactly a inexhaustible resource