Lesson Notes By Weeks and Term v4 - JHS 2

Lesson Video

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Performance objectives

• Identify the physical properties of soil (texture, structure, color, etc.).
• Explain how these properties affect crop production.
• Describe how plants absorb water and nutrients from the soil.

Lesson summary

Soil is the thin layer of earth that supports most plant life. In Ghana, farming (cocoa, maize, cassava, rice, vegetables) depends strongly on soil physical properties such as texture, structure, porosity, and water-holding capacity. Understanding these properties helps learners explain why some crops do well in certain places (e.g., sandy coastal soils vs. clayey valley soils) and how to improve soils for better yields and environmental protection.

Lesson notes

A. What is Soil? Soil is a mixture of: Mineral particles (sand, silt, clay) Organic matter (humus) Water Air Living organisms (worms, insects, microbes)

Plants depend on soil for: Anchorage (support) Water Mineral nutrients Air for root respiration

B. Physical Properties of Soil (What we can observe/measure without changing the soil chemically) 1) Soil Texture (Most important for this indicator) Texture refers to the size of soil particles and the proportion of sand, silt, and clay.

| Soil particle | Size | Feel | Main effect | |---|---|---|---| | Sand | largest | gritty | drains fast, low water holding | | Silt | medium | smooth/soapy | moderate water holding | | Clay | smallest | sticky when wet, hard when dry | holds water strongly, poor drainage |

Evaluation guide

• Examine and discuss the different physical properties of each soil type
• and how these properties help support crop production.
• Observe and describe the growth of different plants on different soil
• types.