this ppt present the water store in soil and also include its factor

1. Water store in Soil
Soil
Defined as the top layer of the earth's crust. It is formed by
mineral particles, organic matter, water, air and living
organisms.
Water store in different forms
Evaporation
Transpiration
Surface runoff
Infiltration
Subsurface
Ground water

2. Evaporation
A type of vaporization of a liquid that
occurs from the surface of a liquid into a
gaseous phase

3. Transpiration
The process by which
moisture is carried
through plants from
roots to small pores on
the underside of
leaves, where it
changes to vapor and
is released to the
atmosphere

4. Surface runoff
The water, from rain, snowmelt, or other sources, that
flows over the land surface, and is a major
component of the water cycle.

5. Infiltration
The process by
which water on the
ground surface
enters the soil. It is
measured in
inches per hour or
millimeters per
hour.

6. Subsurface
The flow of water beneath
earth's surface as part of
the water cycle.
Groundwater
The water located beneath
Earth's surface in soil pore
spaces. A unit of rock or an
unconsolidated deposit is
called an aquifer

7. Different Factor is involved in water stored
Soil Texture
soil will makeup of the
mineral portion.
The soil is composed
of small particles.
These small particles
are the result of massive
rocks of different
mineralogy sand , silt
and clay etc……

8. Sandy soils will
have faster water
transmission an
low water
retention
Clay soils will
have slow water
transmission and
high water
retention

9. Soil structure
The arrangement of soil
particles into groupings.
These groupings are
called peds or
aggregates
which often form
distinctive shapes
typically found with in
certain soil horizons.
For example, granular
soil

10. Gravitational
 Gravitational water occupies
the larger soil pores (macro
pores) and moves down
under the force of gravity.
 Gravitational water is not
use to plants because it
occupies the larger pores.
 It reduces aeration in the
soil.

11. Capillary water:
Capillary water is held in the
capillary pores (micro pores).
Capillary water is retained on the soil
particles by surface forces.
It is held so strongly that gravity
cannot remove it from the soil
particles.
The molecules of capillary water
are free and mobile and are present
in a liquid state.
plant roots are able to absorb it.

12. Hygroscopic water
The water that held tightly on the surface
of soil colloidal particle is known as
hygroscopic water.
It is essentially non-liquid and moves
primarily in the vapor form.
Some microorganism may utilize
hygroscopic water.
Hygroscopic water cannot be separated
from the soil unless it is heated.

13. Water vapour
Present in soil
atmosphere and
move along vapour
pressure gradients
Important for plant
growth
Free water
This is water
saturated soils