Not all black soils crack. The ones that are known to crack are classified as Vertisols by US Soil Taxonomy. They contain large amounts of shrink-swell clays known as smectites. Smectites shrink and crack when dry, and they expand when wet.
Smectites are also chemically active, and they readily form organo-mineral complexes with soil organic matter, which is what gives these soils the black color.
So in essence, the cracking is from the type of clay and the black color is from organic matter that is chemically bound to the clay. Black color is an indicator of organic matter, not cracking.
Another name for black soil is "regur soil" or "black cotton soil."
Black soil, also known as black cotton soil or regur soil, is rich in nutrients such as calcium, magnesium, potassium, and phosphorus. It also contains a high percentage of organic matter which helps improve soil fertility and water retention. The dark color of black soil is due to its high organic content.
Black soil is typically dark brown or black in color due to its high organic matter content. This dark color is a result of the presence of decomposed plant material and other organic matter that enriches the soil.
The soil in India is based on years of geochemical processes and tectonic movements. The main types of soil are black soil, red soil and alluvial soil.
Black soil is called black because of its dark color, which is a result of high organic matter content and rich mineral substances. This soil type contains a high amount of humus, which provides nutrients to plants and contributes to its fertility.
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black soil
Another name for black soil is "regur soil" or "black cotton soil."
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Black soil is formed from basaltic rooks
When you see the soil begi ning to crack
late 1800's- early 1900's
It's called black land because black is fertile soil, and fertile soil is black. Soil is the land so it's named black land.
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