Organically rich soils are formed from organic material. Readily found examples of organic matter that's found on and near the surface of the soil are the breakdown of yard waste such as leaf litter; and the death and decomposition of the critters of the soil food web. Such critters include beetles, earthworms, and microarthropods.
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Decomposed Babies
organic soils are favorable due to their composition. They contain all the constituents that are required for a plant. Also the uptake of water in other soils. The other biomass present in the soil aid in the healthy season.
deserts
Bearing capacity and shrinkage tendencies are reasons why organic soils are unsuitable for foundation support. Organic soils have low bearing capacity and therefore may not be counted upon to tolerate extensive floor plans and multiple stories. They tend to shrink so more and more of the building will be exposed with time.
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Soils sustain life by using organic material for nutreints.
Clay and organic soils hold nutrients better then sandy soils because the sandy soils as the water drains away, the water will carry the nutrients with it. This is called leaching and the nutrients will not be available for the plants to use.
If you are asking for the name of such soils, they are soils formed in residuum, or residual soils. Typically, the soil profile grades into a degraded bedrock called saprolite, with depth, before hiyting hard bedrock.
Soils get their organic material from the plants that live, or have lived, in them. Deserts have few plants to provide this material.
Oswald Schreiner has written: 'Studies in soil oxidation' -- subject(s): Soil oxidation 'The organic constituents of soils' -- subject(s): Soils 'Examination of soils for organic constituents' -- subject(s): Soils, Analysis 'The isolation of harmful organic substances from soils' -- subject(s): Soil chemistry, Soil fertility 'The sesquiterpenes' -- subject(s): Terpenes 'The chemistry of steam-heated soils' -- subject(s): Soils, Analysis
There are few plants in the desert to provide the organic material.
black soil is formed from basaltic rocks
Bruce Leeson has written: 'An organic soil capability classification for agriculture and a study of the organic soils of Simcoe County' -- subject(s): Soils, Classification
Soil micro-organisms control the concentration of organic matter in the soil. Thus, fertile soils are full of soil humus and micro-organisms.
Decomposed Babies
Loamy soils and soils with lots of organic matter are the type of soils that are primarily used by farmers who need to plant crops.