Lesson Notes By Weeks and Term v4 - SHS 3

Lesson Video

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Performance objectives

• Identify different types of agricultural machinery.
• Classify machinery based on their functions.
• Understand the importance of machinery in agriculture.
• Compare traditional tools with modern machinery.

Lesson summary

Topic Introduction: Welcome, future leaders of Ghana's agriculture! For generations, our grandparents have toiled on the land using simple tools like the cutlass and hoe. While these tools are vital, they require immense physical effort and limit the size of farms we can cultivate. To achieve food security and make farming a profitable business, we must embrace modern technology. This lesson introduces us to agricultural machineries—the tools and machines that reduce human labour, increase efficiency, and transform farming from a subsistence activity into a modern enterprise.

Lesson notes

A. Fundamental Definitions Simple Farm Tool: A simple, hand-held device that requires human physical energy to operate. Examples: Cutlass, hoe, shovel, pickaxe, hand fork, hand trowel, sickle. Farm Implement: A device attached to a power source (like a tractor or draft animal) to carry out a specific agricultural task. It does not have its own engine. Examples: Mouldboard plough, disc harrow, ridger, planter. Farm Machine: A more complex piece of equipment with its own engine or power source, designed for a specific agricultural operation. Examples: Combine harvester, rice miller, water pump, corn sheller machine. Agricultural Mechanisation: The use of machinery and equipment to improve the efficiency of farm operations, reduce labour, and increase productivity. B. The Tractor: The Prime Mover

The tractor is the heart of mechanised farming. It is not an implement itself, but a powerful vehicle designed to pull, push, or power other implements. Think of it as the engine that makes everything else work. Key Functions: Traction: Provides the pulling force (drawbar power) for tillage implements like ploughs and harrows. Power Take-Off (PTO): A spinning shaft at the back of the tractor that powers rotary machines like slashers, sprayers, or shellers. Hydraulics: A system that uses fluid pressure to lift, lower, and control heavy implements. C. Classification of Agricultural Machinery Based on Use

We can logically group agricultural machinery according to the sequence of operations on a farm, from preparing the land to processing the harvest. Category 1: Tillage Machinery (Land Preparation)

Tillage is the process of preparing the soil for planting. It is divided into two stages: a) Primary Tillage Implements: Used for the initial, deep breaking of hard or fallow soil. Mouldboard Plough: Description: A large, curved blade (the mouldboard) with a sharp cutting edge (the share). Function: It cuts, lifts, and completely turns over a slice of soil (furrow slice). This buries weeds and crop residue, aerates the soil, and brings nutrients to the surface. Context: Very effective in loamy soils but not suitable for rocky or sticky clay soils. Used extensively in commercial maize, rice, and soybean farming in the northern and transitional zones of Ghana. Disc Plough: Description: Consists of several large, concave, sharp-edged steel discs that are mounted on a frame. Function: It cuts into the soil and rolls over obstacles. Excellent for hard, dry, rocky, or sticky soils where a mouldboard plough would fail. It does not invert the soil as completely as the mouldboard plough. b) Secondary Tillage Implements: Used after primary tillage to break down large soil clods, level the ground, and create a fine seedbed for planting. Harrows (e.g., Disc Harrow, Spike Tooth Harrow): Description: A set of discs or spikes mounted on a frame. Function: They break up soil clods, remove weeds, and create a smooth, fine surface (a fine tilth) ready for planting. Ridger: Description: Consists of two mouldboards joined together to form a V-shape. Function: It is used to create ridges and furrows. This is essential for crops like yam, cassava, maize, and groundnut. Ridging helps with water management, drainage, and tuber/root development. Category 2: Planting Machinery

Evaluation guide

• Identify and classify different types of machinery used in Agriculture
• Collaborative Learning:
• Learners in pairs discuss knowledge of simple farm tools. Knowledge and skills
• demonstrated in