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: 2nd Term
Week: 4
Grade code: 2.1.2.LI.2
Strand code: 1
Sub-strand code: 2
Content standard code: 2.1.2.CS.1
Indicator code: 2.1.2.LI.2
Theme: NEW DAWN 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, our parents and grandparents have worked hard to grow the food we eat, like maize, cassava, yam, and groundnuts. However, they face many challenges: unpredictable rainfall, pests and diseases, and land that is becoming less fertile. To ensure we have enough food for everyone in the future (food security), we need new and smarter ways of farming. This is where "Emerging Technologies" come in. These are modern scientific methods that can help us grow more food, with fewer resources, and in a more sustainable way.
Here, we will break down each of the five major emerging technologies. A. Hydroponics Definition: Hydroponics is a method of growing plants without soil. Instead, the plant roots are suspended in a solution of water mixed with all the essential mineral nutrients they need to grow. How it Works: Plants are held in place by an inert medium like perlite, gravel, or coconut husk (coir). The roots are directly exposed to a specially prepared nutrient solution. This solution provides the exact minerals (like Nitrogen, Phosphorus, Potassium) that the plant would normally get from the soil. The system can be set up in trays, pipes, or vertical stacks, allowing for efficient use of space. Application to Arable Crops in Ghana: Cereals (e.g., Maize, Sorghum): While growing maize to maturity for grain is not cost-effective in hydroponics, it is an excellent method for producing fodder. Maize or sorghum can be grown hydroponically for 7-10 days to produce highly nutritious green fodder for livestock (cattle, goats, sheep), especially during the dry season when pasture is scarce. This supports the livestock component of a mixed farm. Legumes (e.g., Beans): High-value legumes like green beans or snow peas can be grown hydroponically. More practically, it can be used as a nursery system to raise healthy, strong legume seedlings before they are transplanted into the main field. B. Greenhouse Planting Definition: A greenhouse is a structure, usually covered with transparent material like plastic or glass, used for growing crops in a controlled environment. How it Works: Controlled Climate: The greenhouse traps the sun's heat, keeping the plants warm. It also allows the farmer to control temperature, humidity, and light. Protection: It protects crops from harsh weather (heavy rains, strong winds), pests (insects, birds), and diseases. Year-Round Farming: By controlling the environment, farmers can grow crops even during the off-season. Application to Arable Crops in Ghana: Tuber Crops (e.g., Yam, Cassava): Greenhouses are perfect for the early, most vulnerable stages of tuber crop production. For example, producing disease-free yam seedlings or "vine cuttings" in a controlled greenhouse protects them from pests like yam beetles and fungal diseases. This ensures that only healthy material is planted in the main field, leading to much higher yields. Legumes/Cereals: A greenhouse can be used as a nursery to raise high-quality seedlings of valuable crops like tomatoes (often grown in rotation with legumes) or specialized maize varieties, ensuring a high germination rate and strong early growth before transplanting. C. Genetically Modified Organisms (GMOs) Definition: A GMO is an organism (plant, animal, or microorganism) whose genetic material (DNA) has been altered using genetic engineering techniques. This is done to give the organism a new, desirable trait. How it Works: Scientists identify a specific gene in one organism that provides a useful trait (e.g., resistance to an insect). They isolate this gene. Using laboratory methods, they insert this gene into the DNA of a crop plant. The resulting plant now has the new trait. Application to Arable Crops in Ghana: Legumes (e.g., Cowpea): A major problem for cowpea farmers in Ghana is the Maruca pod borer insect, which can destroy over 80% of the crop. The Savannah Agricultural Research Institute (SARI) in Ghana has developed a GMO cowpea variety called Bt Cowpea. It contains a gene from a bacterium (*Bacillus thuringiensis*) that makes the plant produce a protein toxic to the pod borer, but safe for humans and other animals. This means farmers can get a high yield without spraying expensive and harmful chemical pesticides. Cereals (e.g., Maize): GMO maize varieties have been developed that are resistant to pests like the stem borer or are tolerant to drought, a major issue for farmers in the Northern and Savannah regions. D. Tissue Culture (Micropropagation) Definition: Tissue culture is a technique of growing whole plants from a tiny piece of a parent plant (called an 'explant') in a sterile, artificial nutrient medium in a laboratory. How it Works (Simplified): Explant Selection: A small piece of a healthy, high-yielding parent plant is taken (e.g., a shoot tip from a yam vine). Sterilization: The explant is sterilized to remove all germs (bacteria, fungi). Inoculation: It is placed in a test tube or jar containing a nutrient gel (agar medium). Multiplication: The explant grows and multiplies into many tiny plantlets. Rooting & Hardening: The plantlets are moved to a different medium to develop roots, then gradually acclimatized to normal environmental conditions in a greenhouse before being planted in the field. Application to Arable Crops in Ghana: Tuber Crops (e.g., Cassava, Yam): This is the most powerful application. Cassava Mosaic Disease and Yam Mosaic Virus are major diseases that are spread through infected planting materials (stems and setts). Tissue culture allows for the mass production of 100% disease-free plantlets. When farmers plant these clean materials, their yields can increase dramatically. The Council for Scientific and Industrial Research (CSIR) in Ghana uses this technology to produce clean planting materials for farmers. E. Precision Agriculture Definition: Precision Agriculture is a modern farming management concept that uses technology to observe, measure, and respond to variations within a field. It’s about applying the right treatment, in the right place, at the right time. How it Works: Data Collection: Technologies like GPS (Global Positioning System), sensors, and drones are used to collect data about the farm (e.g., soil nutrient levels, crop health, pest locations). Analysis: This data is analysed to create a detailed map of the farm, showing areas that need specific attention. Targeted Action: Farmers then use this information to apply inputs (water, fertilizer, pesticides) only where they are needed and in the exact amounts required, often using GPS-guided machinery. Application to Arable Crops in Ghana: Cereals (e.g., Maize): On a large commercial maize farm in the Afram Plains or Northern Region, a farmer can use a drone equipped with a special camera (NDVI sensor) to fly over the field. The drone’s map will show which parts of the farm have healthy, green plants and which parts have yellowish, nitrogen-deficient plants. The farmer can then use a GPS-guided tractor to apply nitrogen fertilizer only to the weak spots, instead of wastefully broadcasting it over the entire field. This saves money on fertilizer and protects the environment from excess chemical runoff.
Guided Practice (With Solutions)
Let's work through these questions together to check our understanding.
Question 1: A yam farmer in the Bono Region is struggling with Yam Mosaic Virus, which is passed down through the yam setts he uses for planting each year. His yields are very low. Which of the five emerging technologies would be the most direct solution to his problem of obtaining clean planting material? Explain your choice. Solution: Technology: Tissue Culture (or Micropropagation). Explanation: Tissue culture is the best solution because its primary purpose is to produce a large number of genetically identical and, most importantly, disease-free plantlets from a small piece of a parent plant. By using tissue culture, the farmer can obtain certified clean yam plantlets that are free from the Yam Mosaic Virus. Planting these clean materials will break the cycle of disease transmission and significantly increase his yield.