Yellow or red soil indicates the presence of oxidized ferric iron oxides. Dark brown or black color in soil indicates that the soil has a high organic matter content. Wet soil will appear darker than dry soil.
Also question is, what can be grown in black soil?
Black soil is rich in calcium, potassium and magnesium but has poor nitrogen content. Crops like cotton, tobacco, chilly, oil seeds, jowar, ragi and maize grow well in it. Sandy soil is low in nutrient content but is useful for growing trees such as coconut, cashew and casuarinas in areas with high rainfall.
What is a black soil?
Black soil may refer to: Chernozem, fertile black soils found in eastern Europe, Russia, India and the Canadian prairies. Muck (soil), a soil made up primarily of humus from drained swampland. Vertisol, dark cracking soils with a high clay content found between 50° N and 45° S of the equator.
Why black soil is called black?
P.S : It is commonly known as "black cotton soil" as they are perfect for growing cotton. They develop deep cracks in extreme hot weather. Black soils or cotton soils or regur soil represent same. However, the name "Regur" is derived from Latin word.