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: 3
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. For generations, Ghanaian farmers have worked hard using traditional methods. However, our country faces new challenges: a growing population to feed, changing weather patterns (climate change) that make rainfall unpredictable, and soil that is becoming less fertile. To solve these problems, we need new, smarter ways of farming. This is where "Emerging Technologies" come in. These are modern scientific methods that can help us grow more food, use fewer resources like water and land, and create new business opportunities in agriculture.
This section breaks down the five key technologies. We will look at what they are, how they work, and how they can be used for our staple crops in Ghana. a) Greenhouse Planting What is it? A greenhouse is a structure, usually made with a transparent material like plastic or glass, that allows farmers to grow crops in a controlled environment. Think of it as a special house for plants. How does it work? The transparent roof and walls trap the sun's heat, keeping the inside warmer than the outside, which is useful for certain crops. More importantly, it protects plants from harsh weather (heavy rains, strong winds), pests (like grasshoppers and stem borers), and diseases. Farmers can also control irrigation (watering) precisely using systems like drip irrigation inside the greenhouse. Application to Ghanaian Arable Crops: Cereals (e.g., Maize): While it's not economical to grow a whole field of maize in a greenhouse, it is perfect for a nursery. Farmers can raise high-quality, healthy maize seedlings in trays inside a greenhouse. These seedlings are protected from pests and diseases at their most vulnerable stage. After a few weeks, they can be transplanted to the main field, giving them a strong start and leading to a more uniform and higher yield. Legumes (e.g., Cowpea, Tomato, Peppers): Greenhouses are excellent for growing high-value vegetable legumes year-round. This means a farmer in, say, the Ashanti Region can grow tomatoes even during the peak rainy season when outdoor farms are often flooded or suffer from fungal diseases. This leads to a stable supply and better income for the farmer. b) Hydroponics What is it? Hydroponics is a method of growing plants without soil. Instead of getting nutrients from the soil, the plant roots are placed directly in a nutrient-rich water solution. How does it work? The plant is held in place by a neutral medium like gravel, perlite, or coconut husk. A carefully prepared solution containing all the essential minerals a plant needs (Nitrogen, Phosphorus, Potassium, etc.) is circulated around the roots. This gives the plant exactly what it needs, when it needs it, leading to faster growth and higher yields in a smaller space. Application to Ghanaian Arable Crops: Direct Application is Limited for Arable Crops: Growing a whole field of yam or maize hydroponically is currently impractical and expensive. It is mostly used for leafy vegetables and fruits like lettuce and strawberries. Indirect Application (Fodder Production): A very practical use in Ghana is growing fodder for livestock. Farmers can grow maize or other grains hydroponically in trays to produce fresh, green fodder in just 7-10 days. This is a powerful tool for livestock farmers, especially during the dry season when grazing is poor. This supports the larger agricultural enterprise. c) Tissue Culture What is it? Tissue culture (or micropropagation) is a laboratory technique used to grow whole plants from very small pieces of a parent plant (like a piece of leaf, stem, or root). How does it work? A small piece of the desired plant, called an explant, is taken and sterilized. It is then placed in a sterile jelly-like substance (a nutrient medium) in a test tube or jar. This medium contains all the nutrients, hormones, and vitamins the plant needs to grow. In this controlled, clean environment, the explant multiplies into many tiny plantlets. These plantlets are then carefully acclimatized and moved to a nursery before being planted in the field. Application to Ghanaian Arable Crops: Tuber Crops (e.g., Yam, Cassava): This is the most powerful application in Ghana. Many yam and cassava farms suffer from low yields because the planting materials (yam setts, cassava stems) are infected with viruses and other diseases passed down from one generation to the next. Tissue culture allows scientists at institutions like the Council for Scientific and Industrial Research (CSIR) to produce 100% disease-free planting materials. Farmers who use these "clean" seedlings see a dramatic increase in their yields. It's a way to "clean" our best local yam varieties. d) Genetically Modified Organisms (GMOs) What is it? A GMO is a plant, animal, or microorganism whose genetic makeup (DNA) has been altered in a laboratory using genetic engineering. This is done to give the organism a new, desirable trait. How does it work? Scientists identify a specific gene that controls a useful trait (e.g., a gene for insect resistance from a bacterium). They then use special tools to insert this single gene into the DNA of a plant, like maize. The resulting maize plant now has the new trait. It is important to note this is different from conventional breeding, which involves crossing two whole plants and can take many years. Application to Ghanaian Arable Crops: Cereals (e.g., Bt Maize): Fall Armyworm is a major pest that destroys maize farms in Ghana. Scientists have developed "Bt Maize" by inserting a gene from the bacterium *Bacillus thuringiensis*. This gene makes the maize plant produce a protein that is toxic *only* to certain insects, like the Fall Armyworm. When the caterpillar eats the maize leaf, it dies. This reduces the need for farmers to spray expensive and potentially harmful chemical pesticides. Legumes (e.g., Bt Cowpea): The pod borer insect can destroy over 80% of a cowpea harvest. Scientists in Ghana have developed a Bt Cowpea (Pod Borer Resistant Cowpea) that resists this pest. This could dramatically increase cowpea yields and ensure a stable supply of this important protein source. e) Precision Agriculture What is it? Precision Agriculture is a modern farm management concept that uses technology to observe, measure, and respond to variability within a field. Instead of treating a whole farm the same, it treats different parts of the farm based on their specific needs. It's about being precise and efficient. How does it work? It uses tools like: Drones: Flying drones equipped with special cameras can take pictures of the farm. These images can show which parts of the field are healthy and which parts are stressed (e.g., lacking water or nutrients, or being attacked by pests). GPS (Global Positioning System): GPS on tractors can guide them to apply fertilizer or pesticides only where they are needed, avoiding waste. Soil Sensors: These can be placed in the field to measure soil moisture and nutrient levels in real-time. Application to Ghanaian Arable Crops: Cereals/Legumes (Maize and Cowpea): A young Ghanaian entrepreneur with a drone can provide a service to local farmers. They can fly the drone over a 20-acre maize farm. The drone's map might show a yellow patch in one corner, indicating a nitrogen deficiency. The farmer then only applies urea fertilizer to that specific patch instead of the whole farm. This saves the farmer money on fertilizer and protects the environment from excess chemical runoff. The drone can also spot a pest outbreak early before it spreads across the entire farm.
Guided Practice (With Solutions)
Instructions: Let's work through these scenarios together as a class.
Question 1: A yam farmer in the Brong-Ahafo Region complains that every year, her harvest gets smaller. Her yams are small and often look sick. She keeps using tubers from her previous harvest as seeds. Which emerging technology would be the most direct solution to her problem, and why? Solution: Technology: Tissue Culture. Reasoning: The problem is likely due to a build-up of viruses and diseases in her planting materials over many years. Tissue culture is a laboratory process that can create completely new, disease-free yam plantlets from a small piece of a healthy parent plant. By buying these "clean" certified seedlings, she can break the cycle of disease and start a new, healthy farm, which will significantly boost her yield.