Soil organisms and humus

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Lessons are for learners and teachers with an account. Browsing the curriculum — subjects, strands and what each sub-strand covers — stays open to everyone.

• 8 sections of explanation, worked examples and diagrams
• 1 practice task with hints and worked answers
• A quiz that marks itself as you go
• Your progress kept across every subject you take

Other lessons in this sub-strand

1. What soil is and why it matters
2. Composition of soil
3. Soil particles and texture
4. Soil forming processes
5. Factors of soil formation
6. The soil profile
7. The soil catena
8. Main types of soil
9. Properties and characteristics of soil
10. Porosity and permeability
11. Water in the soil
12. Soil organisms and humus
13. Soil fertility and nutrients
14. Soil erosion and degradation
15. Soil management and conservation
16. Significance of soil to humans
17. Soils of Kenya
18. Field study, review and assessment