This document discusses soil structure, including the definition of soil structure as the arrangement of primary soil particles into aggregates called peds. Different types of soil structures are described such as granular, blocky, prismatic, and massive. Soil structure influences properties like density, porosity, permeability and strength. Good soil structure facilitates water and air movement while poor structure restricts it. Soil structure can be altered by tillage or compaction, which can break down natural aggregates. Bulk density, porosity and their relationship to particle density are also covered.
THIS SLIDES SHOWS ABOUT THE KNOWLEDGE ABOUT THE HOW SOIL AIR ARE TRANSMITTED FROM ENVIRONMENT TO SOIL AND ALSO TEMPERATURE CONDUCTION AND CONVECTION AND RADIATION.
Soil water movement
Soil water movement
Soil water movement
Soil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movement
Soil is the home of million of organisms. In agriculture, from seed to grain, soil is a prima factor. It also acts a medium to store water for plants and form of water in soil called soil moisture. Some parameters to check the soil moisture called soil moisture constants. So, soil and water relationship is essential in agriculture.
Soils can process and hold considerable amount of water. They can take in water, and will keep doing so until they are full, or until the rate at which they can transmit water into and through the pores is exceeded. Some of this water will steadily drain through the soil (via gravity) and end up in the waterways and streams, but much of it will be retained, despite the influence of gravity. Much of this retained water can be used by plants and other organisms, thus contributing to land productivity and soil health.
A soil is composed primarily of minerals which are produced from parent material that is weathered or broken into small pieces. Like the classification systems for plants and animals, the soil classification system contains several levels of details, from the most general to the most specific types. The most general level of classification system is the soil order, of which there are 12 major types. This module explains these classes.
Introduction
enlist of problematic soil
Salt affected soil
Characteristic of salt affected soil
Comparison between salt affected soil
Reclamation of Saline soils
Reclamation of sodic soils
Reclamation of saline-sodic soils
Acidic soils
Reclamation of acidic soil
Acid Sulphate soils and its management
Calcareous soil
Properties of Soil Agricultural and Water Availability Impa.docxwoodruffeloisa
Properties of Soil: Agricultural
and Water Availability Impacts
Investigation
Manual
ENVIRONMENTAL SCIENCE
Made ADA compliant by
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PROPERTIES OF SOIL: AGRICULTURAL AND WATER
AVAILABILITY IMPACTS
Overview
Earth’s soil plays a major role in the world’s agriculture and has a
substantial effect on water availability in a given area. In this inves-
tigation, students will analyze the natural porosity and particle size
of soil samples along with the chemical composition and profile of
different soil types.
Outcomes
• Examine the properties of soil and their effects on agriculture
and water availability.
• Describe and identify soil horizons based on their chemical and
physical composition.
• Distinguish between the particle sizes of three different types of
soil: sand, silt, and clay.
• Determine the porosity of different soil types.
• Analyze soil samples for a variety of nutrients to determine soil
fertility.
Time Requirements
Preparation ....................................................................... 5 minutes
Activity 1: Particle Size Distribution and Determination of Soil
Texture
Day 1 ...................... 20 minutes, then let sit for 24 hours
Day 2 ............................................................. 30 minutes
Activity 2: Porosity of Different Soil Types ...................... 60 minutes
Activity 3: pH Test Comparison of Soil Samples ............ 30 minutes
Activity 4: Nitrogen, Phosphorus, and Potash Test Comparisons of
Soil Samples
Day 1 ...................... 20 minutes, then let sit for 24 hours
Day 2 ............................................................. 60 minutes
2 Carolina Distance Learning
Table of Contents
2 Overview
2 Outcomes
2 Time Requirements
3 Background
10 Materials
11 Safety
11 Preparation
12 Activity 1
13 Activity 2
14 Activity 3
16 Submission
16 Disposal and Cleanup
17 Lab Worksheet
Background
Soil Horizons and Chemical Composition
The type of dirt that makes up the dry
surfaces of the earth has numerous effects on
humans and the environment, and vice versa.
Humans can modify the suitability of some
areas for agriculture based on prior land use.
The properties of soil also determine water
availability in a given area. Areas that contain the
most suitable soil for farming are often limited.
Certain properties of soil determine whether
an area is suitable for human activity. When
considering the properties of soil, its texture,
shape, particle aggregation, and suitability for
growth come to mind. These properties all play
a major role in determining the capability of an
area to retain water and air, which are necessary
f ...
THIS SLIDES SHOWS ABOUT THE KNOWLEDGE ABOUT THE HOW SOIL AIR ARE TRANSMITTED FROM ENVIRONMENT TO SOIL AND ALSO TEMPERATURE CONDUCTION AND CONVECTION AND RADIATION.
Soil water movement
Soil water movement
Soil water movement
Soil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movementSoil water movement
Soil is the home of million of organisms. In agriculture, from seed to grain, soil is a prima factor. It also acts a medium to store water for plants and form of water in soil called soil moisture. Some parameters to check the soil moisture called soil moisture constants. So, soil and water relationship is essential in agriculture.
Soils can process and hold considerable amount of water. They can take in water, and will keep doing so until they are full, or until the rate at which they can transmit water into and through the pores is exceeded. Some of this water will steadily drain through the soil (via gravity) and end up in the waterways and streams, but much of it will be retained, despite the influence of gravity. Much of this retained water can be used by plants and other organisms, thus contributing to land productivity and soil health.
A soil is composed primarily of minerals which are produced from parent material that is weathered or broken into small pieces. Like the classification systems for plants and animals, the soil classification system contains several levels of details, from the most general to the most specific types. The most general level of classification system is the soil order, of which there are 12 major types. This module explains these classes.
Introduction
enlist of problematic soil
Salt affected soil
Characteristic of salt affected soil
Comparison between salt affected soil
Reclamation of Saline soils
Reclamation of sodic soils
Reclamation of saline-sodic soils
Acidic soils
Reclamation of acidic soil
Acid Sulphate soils and its management
Calcareous soil
Properties of Soil Agricultural and Water Availability Impa.docxwoodruffeloisa
Properties of Soil: Agricultural
and Water Availability Impacts
Investigation
Manual
ENVIRONMENTAL SCIENCE
Made ADA compliant by
NetCentric Technologies using
the CommonLook® software
Key
Personal protective
equipment
(PPE)
goggles gloves apron
follow
link to
video
photograph
results and
submit
stopwatch
required
warning corrosion flammable toxic environment health hazard
PROPERTIES OF SOIL: AGRICULTURAL AND WATER
AVAILABILITY IMPACTS
Overview
Earth’s soil plays a major role in the world’s agriculture and has a
substantial effect on water availability in a given area. In this inves-
tigation, students will analyze the natural porosity and particle size
of soil samples along with the chemical composition and profile of
different soil types.
Outcomes
• Examine the properties of soil and their effects on agriculture
and water availability.
• Describe and identify soil horizons based on their chemical and
physical composition.
• Distinguish between the particle sizes of three different types of
soil: sand, silt, and clay.
• Determine the porosity of different soil types.
• Analyze soil samples for a variety of nutrients to determine soil
fertility.
Time Requirements
Preparation ....................................................................... 5 minutes
Activity 1: Particle Size Distribution and Determination of Soil
Texture
Day 1 ...................... 20 minutes, then let sit for 24 hours
Day 2 ............................................................. 30 minutes
Activity 2: Porosity of Different Soil Types ...................... 60 minutes
Activity 3: pH Test Comparison of Soil Samples ............ 30 minutes
Activity 4: Nitrogen, Phosphorus, and Potash Test Comparisons of
Soil Samples
Day 1 ...................... 20 minutes, then let sit for 24 hours
Day 2 ............................................................. 60 minutes
2 Carolina Distance Learning
Table of Contents
2 Overview
2 Outcomes
2 Time Requirements
3 Background
10 Materials
11 Safety
11 Preparation
12 Activity 1
13 Activity 2
14 Activity 3
16 Submission
16 Disposal and Cleanup
17 Lab Worksheet
Background
Soil Horizons and Chemical Composition
The type of dirt that makes up the dry
surfaces of the earth has numerous effects on
humans and the environment, and vice versa.
Humans can modify the suitability of some
areas for agriculture based on prior land use.
The properties of soil also determine water
availability in a given area. Areas that contain the
most suitable soil for farming are often limited.
Certain properties of soil determine whether
an area is suitable for human activity. When
considering the properties of soil, its texture,
shape, particle aggregation, and suitability for
growth come to mind. These properties all play
a major role in determining the capability of an
area to retain water and air, which are necessary
f ...
The Physical Properties of the Soil
Inckuding,
1. Soil Texture
2. Soil Structure
3. Soil Color
4. Soil Density
5. Soil Porosity
6. Soil Consistence
7. Soil Temperature
Fundamentals of Soil Mechanics and ConcreteDenis Koval
Training Fundamentals on Soil Mechanics & Concrete by GLobal Construction
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- Compact Soils
- Soil Gradation
- Soil Moisture Content
- Atterberg Limits Test
- Laboratory & Field Compaction Tests
- Types of Compaction Equipment
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2. Objectives
Understand the concept of soil structure and
how it differs from soil texture.
Understand how soil structure influences other
soil properties.
Learn how soil structure affects other soil
properties and why it is important to maintain soil
structure.
Learn how land use and management affects
soil structure.
3. Definition
Soil structure is the arrangement of the
primary soil particles (sand, silt, and clay)
and other soil materials into discrete
aggregates.
4. Peds
Structural units are called peds, and have
distinct boundaries and well-defined planes of
weakness between the aggregates.
Peds consist of primary particles bound together
by cementing agents like organic matter, clay,
and hydrous oxides of iron and aluminum.
Peds can take several shapes.
6. Granular Structure
Resembles cookie
crumbs and is usually
less than 0.5 cm in
diameter.
Commonly found in
surface horizons
where roots have
been growing.
http://soil.gsfc.nasa.gov/pvg/granular.gif
http://soils.usda.gov/technical/manual/images/fig3-30_large.jpg
7. Blocky Structure
Irregular blocks that
are usually 1.5 - 5.0
cm in diameter.
Can be subangular or
angular blocky.
http://soil.gsfc.nasa.gov/
pvg/blocky.gif
http://www.dpi.vic.gov.au/dpi/vro/glenimages.nsf/I
mages/gl167_profile/$File/gl167_profile.jpg
8. Prismatic Structure
Vertical columns of
soil that might be a
number of cm long.
Usually found in lower
horizons.
http://soil.gsfc.nasa.gov/
pvg/prismatic.gif
http://soils.usda.gov/technical/man
ual/images/fig3-27_large.jpg
9. Columnar Structure
Vertical columns of soil that have a salt "cap" at
the top.
Found in soils of arid climates.
http://soil.gsfc.nasa.gov
/pvg/columnar.gif
http://soils.usda.gov/technical/manual
/images/fig3-28_large.jpg
10. Platy Structure
Thin, flat plates of soil
that lie horizontally.
Usually found in
compacted soil.
http://soil.gsfc.nasa.gov/pvg/platy.gif http://soils.ag.uidaho.edu/soilorders/i/Arid_03.jpg
11. Single-grained Structure
Soil is broken into individual particles that do
not stick together.
Always accompanies a loose consistence.
Commonly found in sandy soils.
http://soil.gsfc.nasa.gov/pvg/singlegrained.gif
12. Massive Structure
Soil has no visible structure, is hard to break
apart and appears in very large clods.
http://soil.gsfc.nasa.gov/pvg/massive.gif http://soils.usda.gov/technical/manual/images/fig3-31_large.jpg
13. Grade of Soil Structure
The terms weak, moderate, or strong are used
to describe the grade or how stable the peds are
and how hard they are to break apart.
What do you think
the grade would be
for this picture?
http://soils.usda.gov/technical/manual/images/fig3-27_large.jpg
14. Class of Soil Structure
The size or class of the peds is described
as fine, medium, or coarse.
15. How does structure affect water
movement in soils?
In soils with good structure, the pore
space that occurs between peds is
relatively large and facilitates water and air
movement.
Well-developed structure is very important
in clayey soils.
Clayey soils with poor structure restrict
water and air movement.
16. Degree of Water Movement
http://ohioline.osu.edu/b905/images/006.jpg
StructureStructure
WaterWater
MovementMovement
17. Altering Soil Structure
Unlike texture, structure
can be altered by tillage
or traffic.
Tilling soils that are too
wet, or compacting soils
with heavy equipment
can break down the
natural structural units. http://www.ny.nrcs.usda.gov/progra
ms/images/tractor-tillin.jpg
18. Bulk Density
Soil bulk density is the mass per unit bulk
volume of soil that has been dried to a constant
weight at 105 °C.
19. Bulk Density Example
If we have a soil that weighs 50 grams after
being oven-dried and has a volume of 30
cm3
, what will be the bulk density?
It would be 50 g/30 cm3
or 1.67 g/ cm3
.
20. Bulk Density in the Field
Bulk density of organic soils can be very
low, such as 0.5 g/cm3.
Clayey soils have higher bulk densities.
Compacted clay soils have very high bulk
densities, between 1.6 and 1.8 g/cm3.
21. Particle Density and Porosity
Particle density is the mass per unit volume of
soil particles.
Particle density is a relatively constant
parameter and is sometimes assumed to be
2.65 g/cm3
.
22. Bulk Density vs. Particle Density
http://soil.gsfc.nasa.gov/pvg/pd3.htm
23. Porosity
Soil porosity is the percentage of a soil that is pore
space or voids.
The average soil has a porosity of about 50%, and the
pores are filled with air or water depending on the
moisture content.
Sands have larger pores, but less total pore space than
clays.
If both bulk density and particle density are known, the
total porosity can be calculated using these values.
24. Soil Permeability
Soil permeability is the ease with which air,
water, or plant roots penetrate or pass through
soil.
Soils with large pores that are connected are
more permeable.
Rainwater soaks in readily and moves down
through the soil profile.
Clayey soils can have greater total porosity than
sand and still be less permeable than sand since
the pores are small.
25. Soil Strength
Soil strength is defined as the amount of
force required to move or rearrange soil
particles.
Soil strength is an important physical
property affecting plant growth and
seedling emergence.
It is affected by three main factors;
moisture content, soil texture, and bulk
density.
26. Moisture Content & Soil Strength
Water content is the most important factor
determining soil strength.
The lower the soil water content, or the
drier the soil, the greater the soil strength.
Soils that are saturated, or waterlogged
have weak soil strengths.
27. Moisture Content
Which soil would have the greater soil
strength?
http://www.wy.blm.gov/botany/pic
s/cob-duckswamp-500wfo.jpg
http://www.research.noaa.gov/spot
lite/archive/images/drysoil.jpg
28. Soil Texture & Soil Strength
Soil texture also affects soil strength.
Soil strength of aggregated soils increases as clay
content increases.
Poorly aggregated or single grain soils (sands, loamy
sands, sandy loams) usually have the weakest soil
strengths unless they are cemented or compacted.
Individual particles of single grain (sandy) soils are easy
to rearrange, but these soils are susceptible to
compaction, sometimes resulting in the formation of hard
pans.
29. Bulk Density & Soil Strength
Bulk density is the third factor affecting soil
strength.
As bulk density of a given soil increases
soil strength also increases.
Remember that soil is composed of solids
and pores, and the greater the bulk
density the greater the amount of solids,
and the smaller the amount of pore space.
30. Soil Management Problems
Two examples of management problems caused
by increasing soil strength are soil crusts and
tillage pans.
A soil crust is a thin soil layer that forms at the
soil surface following heavy rains.
Tillage or hard pans are high bulk density (>1.7
g/cm3
) layers that occur within the Ap and E
horizons.
Compaction caused by traffic of equipment,
vehicles, or even foot traffic often increases soil
strength to levels that restrict root penetration
and plant growth.
31. Penetrometers
The force required to push
a rod into the soil is a
measure of soil strength.
Penetrometers are devices
used to measure the
resistance of a soil to
penetration to estimate the
effect of compaction on
growth, and to detect layers
of different soil strength.
http://agnews.tamu.edu/dailynews/stories
/SOIL/photos/May0505a-lr.jpg