Soil colour: a field clue, not a full test
Agriculture · Grade 10 · about 40 minutes
Dark, red, pale and grey-mottled colours hint at humus, iron, leaching or waterlogging. Confirm with feel, pH and a crop.
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- 7 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
- Soil properties that make a crop
- Soil texture: sand, silt, clay and loam
- Soil structure: crumbs that roots can use
- Porosity, drainage and water the crop can use
- Soil colour: a field clue, not a full test
- Soil pH: the chemical window for roots
- Soil nutrients: N, P, K and the rest
- Humus: the heart of a fertile topsoil
- Soil organisms: the workers you rarely see
- The soil profile and the crop layer
- Kenyan soils: black cotton, red loam, sandy coast
- Investigate: jar, pH, humus - then maize and sukuma