Lesson Notes By Weeks and Term v4 - SHS 1
MODERN MECHANIZED AGRICULTURE
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MODERN MECHANIZED AGRICULTURE
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Agriculture
Class: SHS 1
Term: 1st Term
Week: 18
Grade code: 1.2.2.LI.2
Strand code: 2
Sub-strand code: 2
Content standard code: 1.2.2.CS.3
Indicator code: 1.2.2.LI.2
Theme: MODERN TECHNICAL AND MECHANISED AGRICUTURE
Subtheme: MODERN MECHANIZED AGRICULTURE
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For generations, farming in Ghana has been synonymous with the cutlass and the hoe. While these tools are essential, they often involve a lot of physical labour (drudgery) and limit the size of farms we can cultivate. Modern mechanized agriculture introduces machines and implements that help us work faster, more efficiently, and on a larger scale. This lesson will introduce you to the world of farm machines, focusing on how to operate them safely and keep them in good condition. Understanding this is crucial for anyone interested in farming as a modern business, ensuring food security for our communities and creating new job opportunities.
A. What is Farm Mechanization? Farm mechanization is the use of machinery and implements to replace human and animal power in agricultural operations. It ranges from simple hand-operated tools like a corn sheller to complex machines like a tractor or combine harvester.
Traditional Farming vs. Mechanized Farming | Feature | Traditional Farming | Mechanized Farming | | :--- | :--- | :--- | | Power Source | Human labour (cutlass, hoe) | Mechanical power (engines) | | Speed of Work | Slow, tedious | Fast, efficient | | Scale of Farm | Small-scale / Subsistence | Large-scale / Commercial | | Labour Required | High | Low | | Cost | Low initial cost, high labour cost | High initial cost, lower running cost | B. Common Farm Machines and Their Functions Tractor: A powerful vehicle that pulls other implements. It's the "workhorse" of the modern farm. Plough: An implement pulled by a tractor to turn over the soil in preparation for planting (primary tillage). Harrow: Used after ploughing to break soil clods into a finer tilt, creating a good seedbed (secondary tillage). Planter/Seeder: A machine that sows seeds in rows at the correct depth and spacing. Knapsack Sprayer: A device carried on the back to apply liquid chemicals like pesticides, herbicides, or liquid fertilizers. Mist Blower: A motorized sprayer that uses a fan to blow fine droplets of chemicals over a wider area, often used in cocoa or fruit tree farms. Combine Harvester: A large, complex machine that performs three tasks at once: reaping (cutting the crop), threshing (separating the grain from the stalk), and winnowing (cleaning the grain). Used for maize, rice, etc. Corn Sheller: A machine that removes maize kernels from the cob quickly. C. Operating a Simple Farm Machine: The Knapsack Sprayer Operating machines safely and correctly is the most important skill. Let's use the knapsack sprayer as our example.
Step 1: Pre-Operation Checks & Risk Assessment (The "SAFE" Method) Before you even touch the machine, think SAFE! S - Survey the Area: Check the field for obstacles (stones, stumps). Check the wind direction to avoid spray drift onto yourself or other crops. A - Assess the Machine: Is the tank clean? Are the straps secure? Are there any leaks in the hose or nozzle? Is the pump handle working freely? F - Follow Instructions: Read the label of the chemical you are using. Understand the correct mixing ratio and the specific safety warnings. E - Equip Yourself (Personal Protective Equipment - PPE): Wear the right gear to protect yourself. Overalls or long-sleeved clothing: To cover your skin. Wellington boots: To protect your feet. Gloves (chemical-resistant): To protect your hands. Goggles: To protect your eyes. Nose/mouth mask or respirator: To avoid inhaling chemicals.
Step 2: Operation Procedure Mixing: Pour the required amount of clean water into the sprayer tank first, then add the measured amount of chemical. Close the lid tightly and shake gently to mix. *Never mix chemicals with your bare hands.* Pressurizing: Place the sprayer on your back and adjust the straps so it is comfortable. Pump the handle up and down about 10-15 times to build pressure inside the tank. Spraying: Point the nozzle towards the target plants. Squeeze the trigger/lever to release the spray. Walk at a steady, consistent pace to ensure even coverage. Keep the nozzle at the recommended height above the plants. Monitoring: While working, occasionally check for leaks and listen for any unusual sounds. Re-pressurize as needed when the spray pressure drops.