Which among the following soils are spread in the large part of Andhra pradesh?

🔑Key Points:
-Red soil is formed from weathering of crystalline granite (igneous rocks) and gneiss (metamorphic rocks) in areas of low rainfall.
-The reddish color of soil is due to the diffusion of iron in crystalline and metamorphic rocks.
-It covers more than 66% of the total cultivated area of Andhra Pradesh and is mostly confined to the Rayalaseema region.
-Also known as ultisols.
-In the hydrated form, it appears yellow.
-Rich in iron, potash, and potassium.
-Lacks nitrogen, phosphorus, and humus.
-Apart from red soil, fertile deltaic alluvial soil and coastal sands are also present in Andhra Pradesh. 

🔴 Additional Information::Alluvial Soil:
-Mostly found in the northern plains.
-Covers 40% of the total area of the country.
-New alluvium is called Khadar and older deposits are called Bangar.
-Rich in potash, humus content, and phosphoric acid.

• Black Soil:
-Formed from volcanic lava and basaltic rock.
-Also known as vertisols and ragur soil.
-It can retain moisture for a long time.
-Rich in lime, iron, magnesia, and alumina. 
-It develops cracks during the dry season.