WEEK 4

SUBJECT: AGRICULTURAL SCIENCE

TERM: 1^ST TERM

CLASS: PRIMARY 5

Processes of Soil Formation�

Soil formation occurs more quickly through the action of water, wind, man and animals.

1. Ploughing: Man clears the vegetation on the land. He leaves some to decay on the ground to form soil. He puts some in the soil in the form of manure. All these decay to form soil.

2.�Mulching: Man cuts grasses and spreads them on seed beds in the form of mulch. These grasses later decay to form soil.

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3.�Movement of rocks: Man carries rock pieces in Lorries and tippers from one place to another, where they are deposited to form soil.

4. Compost making: Man cuts some plants and uses them to make compost. He spreads the compost on his farm where it mixes with other particles to form soil.

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5.�Household waste: Man drops household waste in refuse dumps. The contents of refuse dumps decay to form farmyard manure and compost. The manure is spread on the farm where it forms soil

Action of wind�

Animals, such as termites, eat dead plants and change them to soil through their droppings.� Action of animals�

Wind blows across deserts and dry areas carrying soil particles with it. These particles fall and cover grasses and shrubs. The grasses and shrubs later die where they are covered. When rain falls, they decay and form soil.�

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ASSESSMENT AND EVALUATION

1. Describe how the action of wind helps in soil formation.
2. Describe each of these activities.
3. Name four activities of man that help in soil formation.
4. Name six agents of soil formation.

WRAP UP (CONCLUSION): Teacher goes over the topic once again for better understanding.

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ASSIGNMENT

1. Describe how the action of wind helps in soil formation.

2. Describe each of these activities.

3. Name four activities of man that help in soil formation.

4. Name six agents of soil formation.