Lesson Notes By Weeks and Term v4 - SHS 1
EMERGING TECHNOLOGIES IN AGRICULTURE
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EMERGING TECHNOLOGIES IN AGRICULTURE
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Agricultural Science
Class: SHS 1
Term: 1st Term
Week: 3
Grade code: 1.1.2.LI.2
Strand code: 1
Sub-strand code: 2
Content standard code: 1.1.2.CS.1
Indicator code: 1.1.2.LI.2
Theme: NEW DAWN IN AGRICULTURE
Subtheme: EMERGING TECHNOLOGIES IN AGRICULTURE
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Welcome, students. Today, we are exploring the exciting future of farming in Ghana. For generations, we have relied on the cutlass, the hoe, and the rain. While these methods have fed our nation, they face new challenges: climate change is making rainfall unpredictable, pests are becoming harder to control, and our growing population needs more food than ever before. This lesson introduces "Emerging Technologies" – new and intelligent ways of farming that can help us grow more vegetables and beautiful ornamental plants with fewer resources.
This section breaks down the core ideas you need to understand. We will focus on technologies that are becoming increasingly important for growing vegetables (like tomatoes, peppers, cabbage) and ornamental plants (like hibiscus, bougainvillea, roses). What are "Emerging Technologies" in Agriculture?
These are not just any tools. "Emerging Technologies" are modern, often science-based, methods and equipment that improve farming efficiency, increase yields, and reduce waste and environmental impact. They represent a shift from traditional, labour-intensive farming to a more precise, controlled, and data-driven approach. This is often called "Precision Agriculture" or "Climate-Smart Agriculture".
Technology 1: Greenhouse / Screenhouse Farming What is it? A greenhouse is a structure with walls and a roof made of transparent material (like polythene or glass) where crops are grown under controlled conditions. A screenhouse is similar but uses netting to keep pests out while allowing for natural ventilation. How it works: A frame (metal or wood) is built and covered with the appropriate material. Inside, the environment is managed: Temperature & Humidity: Can be controlled with vents, fans, or cooling pads. Pest & Disease Control: The physical barrier prevents pests like whiteflies and fruit borers from reaching the crops. This drastically reduces the need for chemical pesticides. Watering: Often combined with drip irrigation (see next technology) for efficient water use. Light: The transparent cover allows sunlight in for photosynthesis while protecting plants from harsh rain or wind. Advantages in Ghana: Year-Round Production: Farmers can grow high-value vegetables like bell peppers and tomatoes even during the heavy rainy season or the dry Harmattan, ensuring a steady income. Pest and Disease Reduction: Greatly reduces crop damage and the cost and health risks of pesticides. Higher Yields & Quality: Protected plants produce more and better-looking fruits, which fetch a higher price at markets like Shoprite, MaxMart, or for export. Efficient Water Use: Reduces water loss through evaporation. Disadvantages / Challenges in Ghana: High Initial Cost: The cost of setting up a standard greenhouse can be prohibitive for many small-scale farmers. Technical Know-How: Requires knowledge to manage the internal environment effectively. Poor management can lead to disease outbreaks (e.g., fungal growth if humidity is too high). Overheating: If not properly ventilated, greenhouses can become too hot in the Ghanaian climate, stressing the plants. Ghanaian Example: A youth group in the Ashanti Region secures a loan to set up a greenhouse for tomato production. They can now supply fresh tomatoes to hotels in Kumasi all year, even when open-field tomatoes are scarce and expensive.
Technology 2: Drip Irrigation and Fertigation What is it? Drip irrigation is a method of watering plants by delivering water slowly and directly to the plant's root zone through a network of pipes and small outlets called "emitters." Fertigation is simply the process of adding liquid fertilizers to the irrigation water. How it works: A water source (e.g., a tank, a borehole) is connected to a main pipe. Smaller "drip lines" with emitters are laid along the rows of plants (e.g., peppers, garden eggs, or potted ornamental flowers). When the system is turned on, water drips out slowly, soaking the soil only where it's needed. For fertigation, a fertilizer injector is used to mix nutrients into the water before it goes to the plants. Advantages in Ghana: Water Conservation: Extremely efficient. It can reduce water use by up to 70% compared to sprinkler or flood irrigation. This is crucial in the Northern, Upper East, and Upper West regions. Reduces Weed Growth: Since water is only applied to the crop's roots, the areas between rows remain dry, suppressing weed growth. Prevents Leaf Diseases: Keeping the leaves dry reduces the risk of fungal diseases that thrive in moist conditions. Precise Nutrient Application: Fertigation ensures that every plant gets the exact amount of nutrients it needs, reducing fertilizer waste and water pollution. Disadvantages / Challenges in Ghana: Initial Setup Cost: While cheaper than a greenhouse, the cost of pipes, filters, and a pump can still be a barrier. Clogging: The emitters can get blocked by sand, silt, or algae if the water is not properly filtered. This requires regular maintenance. Requires a reliable water source. Ghanaian Example: A vegetable farmer in the Dawhenya irrigation area uses drip irrigation to grow okra. She saves money on water bills, spends less time weeding, and gets a better harvest because her plants are consistently watered.