Plan of work

FIRST WEEK

Why we study the soil
The soil layers

· Read pages 4 to 12.
Is there a big hole in your village? If there is, look at it carefully. If there is not, dig one.

· Compare what you see with the drawings. Perhaps you don't see all the layers shown in the drawings.

· Take a good look at the part of the soil where the roots are.

SECOND WEEK

What is soil made of?
Sand, clay and silt.

· Read pages 13 to 21.

· Do the experiment described on page 13.
Take a good look at it.

· Learn to see what the soils are like where you live.

Are they clay soils?
Or sandy?
Or silty?

· Do carefully all the experiments shown.

THIRD WEEK

Humus and the soil.

· Read pages 22 to 27.

· To help your memory reread pages 4 to 21.

· Look carefully at the drawing on page 23.
It will help you to understand.

· Find out what crops make the soil poor in humus.

How is humus added to the soil?

FOURTH WEEK

Water and die soil.

· Read pages 28 to 36.

· Do the two experiments described on pages 30 and 32.

· Take a good look at the drawing on page 31.
It shows you all the movements of water in the soil.

· Reread the whole booklet.

· Answer the question paper.

When you have understood fully, try to answer all the questions.
Do not rush.
Make sure you understand before you write.