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: 2
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, future leaders of Ghanaian agriculture! For generations, farming in Ghana has relied on the strength of our hands, the cutlass, and the hoe. While these tools are vital, the world is changing. Our population is growing, cities are expanding, and our climate is becoming less predictable. To feed our nation and create wealth, we must embrace new and smarter ways of farming. This lesson introduces you to the exciting "emerging technologies" that are transforming how we grow vegetables like tomatoes, peppers, and cabbage, and beautiful ornamental plants for our homes and cities.
What are "Emerging Technologies in Agriculture"?
These are new, modern, and innovative methods, tools, and systems used in farming to improve efficiency, increase yields, and reduce waste. Think of it as "Farming 2.0" – moving beyond basic methods to more precise, controlled, and productive agriculture. We will focus on technologies perfect for high-value crops like vegetables and ornamentals.
Technology 1: Drip Irrigation What is it? A highly efficient method of watering plants. Instead of flooding the field or using a watering can, a network of pipes with small holes (called emitters) delivers water directly to the base of each plant, drop by drop. How it Works: Water is sourced from a tank, borehole, or dam. It flows through a main pipe, then into smaller tubes (drip lines) that run alongside the rows of plants. Emitters are placed at the base of each plant (e.g., a tomato plant, a rose bush). Water trickles out slowly, soaking the root zone without wetting the entire soil surface. Advantages for Ghana: Water Conservation: Crucial for farmers in the Northern, Upper East, and Greater Accra regions where water is scarce. It can use up to 70% less water than traditional methods. Reduced Weed Growth: Since only the plant's base is watered, the spaces between rows remain dry, suppressing weed growth. This saves time and labour on weeding. Fertigation: Liquid fertilizer can be mixed with the irrigation water (a process called *fertigation*), delivering nutrients directly to the roots for efficient uptake. Higher Yields: Plants get a consistent supply of water, reducing stress and leading to healthier growth and more produce. Disadvantages/Challenges: Initial Cost: The cost of pipes, emitters, filters, and a pump can be high for a small-scale farmer. Clogging: Emitters can get blocked by sand, silt, or salt deposits, requiring regular cleaning and filtration. Technical Know-how: Requires some knowledge to design, install, and maintain the system. Ghanaian Example: A vegetable farmer in the Dawhenya irrigation area wants to grow green peppers. Instead of relying on the flood irrigation channels which are sometimes unreliable, she invests in a drip irrigation system using a polytank. She saves water, reduces fungal diseases (as leaves stay dry), and can now farm productively even in the dry season.
Technology 2: Greenhouse Farming (Protected Cultivation) What is it? Growing crops inside a structure covered with transparent material like polythene or netting. This creates a controlled environment, protecting plants from the harsh outdoor conditions. How it Works: A frame (made of wood, bamboo, or galvanized steel) is built. The frame is covered with a special UV-treated polythene sheet (for rain protection) or insect-proof netting (for pest protection). This controlled space allows the farmer to manage temperature, humidity, and pests more effectively. Advantages for Ghana: Year-Round Production: Farmers can grow vegetables like tomatoes and sweet peppers even during the heavy rainy season without worrying about fungal diseases caused by rain splashing on leaves. Pest and Disease Control: The covering acts as a physical barrier, keeping out many insect pests like whiteflies and fruit borers, thus reducing the need for chemical pesticides. Higher Quality Produce: Protected from sun scorch, heavy rain, and wind, the vegetables and flowers produced are often cleaner, unblemished, and fetch a higher price in markets like Shoprite or for export. Improved Water Efficiency: Water loss through evaporation is much lower inside a greenhouse. Disadvantages/Challenges: High Initial Investment: Building a standard greenhouse is expensive. Heat Build-up: In Ghana's hot climate, temperatures inside a polythene-covered greenhouse can become too high for plants if not properly ventilated. Using netting (net-house) or having large side vents is essential. Requires Technical Skills: Managing the climate and crop health inside a greenhouse requires more knowledge than open-field farming. Ghanaian Example: A youth group in Kumasi wants to supply high-quality lettuce to hotels. They build a simple greenhouse using a wooden frame and insect-proof netting. This protects the delicate lettuce from pests and the harsh sun, allowing them to produce clean, healthy leaves all year long and command a premium price.