Capillarity of Soils

Purpose

To compare the rise of water by capillarity in sandy, clayey, and loamy soil


Additional information

Capillarity is the phenomenon by which water rises in a cylindrical column. The narrower the column the higher the capillarity; similarly, the denser the substratum present in the column, the higher the capillary effect.

This is the reason why clayey and loamy soils are better options when it comes to growing healthy plants; along with being rich in nutrients it also retains moisture and helps water reach the transport channels of plants thereby helping them grow well.


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Required materials

  • Sandy soil sample
  • Clayey soil sample
  • Loamy soil sample
  • 3 Glass tubes (open at both ends)
  • Water
  • Beaker to hold the glass tubes
  • Glass wool to plug one end of each of the glass tubes

Estimated Experiment Time

Approximately 10 minutes to set up the apparatus and 1-2 days to carry out the observations


Step-By-Step Procedure

  • 1. Plug one end of the glass tubes using glass wool.
  • 2. Pack 3 long glass tubes tightly with dry sandy, clayey and loamy soil; clearly label each tube.
  • 3. Fill the beaker with water.
  • 4. Immerse the tubes vertically in the beaker with the plugged end towards its base.
  • 5. Make note of the levels of the water as it rises in the glass tubes containing each type of soil.

Note

N/A


Observation

Initially the water rises fastest in the sand, followed by the loamy soil, and clayey soil. However after a day or two, the water fails to rise any higher in the tube containing sand, whereas in those containing clay and loam continue to rise until it reaches the top of the tube. The level in the loam may rise and drop but usually stabilizes very close to the water level in the tube containing clayey soil.


Result

Clayey soil has the highest capillarity, followed by loamy and sandy soil.


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