The document describes the different horizons that make up a soil profile. It discusses the O, A, E, B, C, and R horizons. The O horizon is at the top and consists of organic matter like leaf litter. The A horizon below it is the topsoil and is dark and rich in nutrients. Below the A horizon are the E, B, and C horizons, which get progressively lower in nutrients and deeper in the ground, with the B horizon containing clay and minerals and the C horizon contacting bedrock. The document emphasizes that understanding the soil profile is important for determining suitable agriculture and plant nutrient availability.

1. 01
Presentation on Soil Profile
Presented By
Md. Rasel Ali
Reg:AGRW2017000494
Faculty of
Agriculture
EBAUB

2. Soil Profile
02

3. Different Horizon in Soil Profile
03

4. ⬥ Organic matter Horizon
⬥ Dark in color, soft in texture
⬥ Several O-layers can occur
in some soils, consisting O-
Horizon.
⬥ Humus
⬥ Leaf litter
04
O
Horizon

5. ⬥ Top soil or Biomantle horizon,
mineral soil
⬥ Dark in color and 2-10 feet depts.
⬥ Smallest and finest soil particle.
05
A
Horizon

6. ⬥ Leaching Layer
⬥ Small layer between A & B horizons
⬥ Light in color
⬥ Poor mineral and clay content due to
leaching
⬥ Soil particles larger than in A horizon but
smaller than in B horizon 06
E
Horizon

7. ⬥ Some organic material may reach
here through leaching.
⬥ Plant roots can extend into this
layer.
⬥ At depths of 10-30 feet
⬥ Red/brown in color due to oxides
of Fe & clay
⬥ Rich in clay and minerals
07
B
Horizon

8. ⬥ The “Regolith” Horizon
⬥ The soil layer lying beneath the B
horizon.
⬥ At depths of 30-48 feet
⬥ Rich in minerals that leached
(moved down) from the A or E
horizons and accumulated here.
08
C
Horizon

9. ⬥ The “Bedrock” Horizon
⬥ Deepest soil horizon in the soil
profile.
⬥ At depths of 48+ feet
⬥ The layer of partially weathered or
unweathered bedrock at the base of
the soil profile.
9
R
Horizon

10. importance of soil profile
⬥ The soil profile is an important tool in nutrient management.
⬥ It helps to determine the best soil suitable for agriculture.
⬥ It identifies the part where plant nutrients can be found, that is
the top soil, is the richest part of the soil.
⬥ It also helps to determine the level in which water can be
available in the soil.
⬥ The nature of the parent material will also determine the type of
mineral salts available to plants.
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11. Thank you for your
patience
ANY QUESTIONS?
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