Explanation

Soil profile maximum have three horizon, i.e., A, B and C. B-Horizon It is also called sub-soil. The thickness can be up to 1.0 m. The sub-soil receives various material reached from top soil. This horizon is poor in aeration and biological activity. It is rich in plant humus and nutrients The appearance of different layers superposed one above the other in a vertical section of the soil from survive downward to present rock is called soil profile. Soil Horizones Soil layers running roughly parallel to the surface, which have distinct feature from other layer A soil contains maximum three horizon, i.e., A, B and C The surface litter yield is called O-horizon [image:13_image32.png] Soil profile A-0 freshly fallen litter (partly decomposed) A-00 organic matter (fermentation level and humus level) $A_{1}$-organic debris + mineral. $A_{2}$-light colour due to leaching $A_{3}$-may be present or absent B-Horizon-iron and aluminium compounds. $B_{1}$-transitional layer. $B_{2}$-dark coloured, maximum amount of leached material. $B_{3}$-large chunk of parent rock material + leached material C-thick, large masses of weathered mineral material D-Unweathered parent rock material