Subject Matter: PROPERTIES OF SOIL

OBJECTIVES:

By the end of the lesson pupils will be able to:

  •  determine two differences in loamy, sandy and clayey soils;
  • demonstrate the water holding capacity of loamy, sandy and clayey soils

INTRODUCTION
Short talk or discussion about real life experiences related to water holding capacity. (eg: erosion of sports grounds of the school ) Through question and answer method, pupils state the types of soil near their houses and in the school garden.

ACTIVITY 1:
Pupils touch/feel and describe the soil samples in terms of colour, texture, and particle size and record their observations in a table.

ACTIVITY 2:
Using the same type of soil samples, pupils find out if the different types of soil allow water to pass through them at the same rate. Let the group leaders read out their observations and discuss their groups’ findings with the class.
For the instructions, refer to worksheet or teaching approach on an attached paper.

APPLICATION:
Pupils discuss which soil will be best for planting in the school garden or their gardens at home (Note that different kinds of plants also determine suitable soil type.)

CONCLUSION:
e.g. Loamy soil is suitable for growing cabbage.

CORE POINT 1:
Sandy soil has larger particles and is brownish in colour. It feels very rough between the fingers. Clayey
soil has smaller particles and is whitish or brownish in colour depending on its location. It feels very smooth
and has medium size particles.

CORE POINT 2:
Different soils allow water to drain through them at different rates. Sandy soil allows water to pass through
it easily. Loamy soil allows water to pass through it better than clayey soil.

CORE POINT 3:
Clayey soil retains water most while loamy soil holds sufficient water for plant growth.

ORAL QUESTIONS:
What type of soil is in the school garden?
What type of soil is on the school compound?
What is the colour of the soil in the school garden?

WRITTEN QUESTIONS:
There are 3 main types of soil.
Which soil type will dry up more quickly and why?
Which soil would be best for growing crops in the school garden and why?