To Study Physical Properties of Soil – MeitY OLabs


To Study Physical Properties of Soil Soil is the upper humus, containing a layer
of the earth, consisting of rock and mineral particles mixed with decayed organic matter.
Soil sustains plant life and contains numerous living organisms. Soil, along with air and
water, is one of the three most important natural resources, and we cannot live without
it. In this video, we will see how to find the pH of soil, texture of soil, moisture
content of soil and water holding capacity of soil. To Study pH of Different Types of Soil. Materials Required: Garden soil, roadside soil, riverside soil,
filter paper, distilled water, funnel. spatula, glass rod, test tubes and a beaker containing
water. Procedure: Let�s first prepare the soil solution.
Using a spatula, transfer some riverside side soil from the watch glass and dissolve it
into the beaker containing water. Similarly repeat the same procedure for the
other soil samples. Using a glass rod, stir the solution to mix
it. Place a folded filter paper into the funnel
and place it on the test tube. Take garden soil solution and filter the solution
through a filter paper and collect the filtrates in a test tube.
Repeat the same procedure for other samples and collect the filtrates in test tubes.
The soil solution is now ready for testing pH.
There are two ways of finding the pH value of the solution: Using pH Paper Materials Required: Soil solutions, droppers, pH paper booklet
and a tile. Procedure: Take a pH paper strip from pH booklet and
dip into the test tube that contains riverside soil.
Keep the wet pH paper strip on the tile. Do the same procedure for roadside soil and
garden soil. Wait for some time to dry the pH paper.
Note the colour and compare with the colour chart given on the broad range indicator paper
and get a rough estimate of pH of the sample solution.
We can observe that riverside soil has pH 9 and garden soil and roadside soil have pH
7. Using Universal Indicator Solution Materials Required: Soil solutions, dropper and universal pH indicator
solution. Procedure: Using a dropper, take some universal indicator
solution. Put some indicator solution into the test
tube that contains soil sample. Shake the solution to mix it well.
Note the colour developed and compare it with the colour chart.
We can observe that riverside soil has pH 9 and garden soil and roadside soil have pH
7. To Study the Texture of the Soil Materials Required: Soil sample in a measuring cylinder and a
beaker containing water. Procedure: Take beaker containing water and pour some
water into the measuring cylinder. Shake the measuring cylinder to mix the sample.
Allow the soil particles to settle. Observe the thickness of the layers formed
by different types of particles in the measuring cylinder.
The thickness of clay particles in measuring cylinder is 17%, silt particles is 9% and
sand particles is 74 %. If we know the sand, silt, and clay percentages
of a soil, then the textural class can be identified from the textural triangle.
Here, the sample soil has 17% clay, so draw a line corresponding to percent clay. Similarly
draw the lines for percent sand (74%) and percent silt (9%). The lines which intersect
indicate the soil type we have. So, the sample soil type is sandy loam. To Study Moisture Content of Soil Materials Required: Crucible contains garden soil and road side
soil, weighing balance and burner. Procedure: Take the crucible containing garden soil and
weigh the soil sample on a weighing balance. Record the initial value into the table.
Take crucible and place it over the Bunsen burner.
Heat the soil for some time till the soil becomes dry.
Weigh the crucible again to record the weight of dry soil.
Record the final value into the table. Similarly, do the same procedure with roadside
soil and record the initial and final values into the table.
The difference between initial and final weights indicates the moisture content of the soil. Conclusion Garden soil shows a higher difference between
initial and final weight indicating the higher moisture content in the garden soil than the
road side soil. Water Holding Capacity of Soil Materials Required: Garden soil, road side soil, tin boxes with
perforated bottom, filter paper, glass rod, small glass rods, petridish and weighing balance. Procedure Take a filter paper and place it in the bottom
of the tin box. Weigh the tin, along with the filter paper,
and note its weight. Take the beaker containing garden soil and
transfer the soil sample into the tin box. Take a glass rod and press the soil inside
the tin gently several times so that soil is compactly filled and forms a uniform layer
at the top. Weigh the tin box along with soil sample and
note its weight. Take a Petri dish filled with water.
Take two small glass rods and place them parallel to and at a small distance from each other.
Place the soil filled tin on the two glass rods in such a manner that its bottom is in
contact with water. Leave the set up undisturbed till water appears
at the upper surface of the soil. Wait till entire soil surface is wet.
Remove the tin and allow all the gravitational water to flow out from the bottom.
When no more water percolates, wipe the bottom and dry it with a filter paper.
Weigh again and note its weight. Similarly, do the same procedure with roadside
soil and record all the values into the table. Calculate the percentage of water holding
capacity of the garden soil and roadside soil. Conclusion Garden soil retains more water and thus has
higher water holding capacity than the roadside soil.

4 thoughts on “To Study Physical Properties of Soil – MeitY OLabs

Leave a Reply

Your email address will not be published. Required fields are marked *