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, future leaders of Ghanaian agriculture! For generations, our parents have farmed the land using methods passed down through time. These methods have fed our nation. However, our country is changing. The population is growing, the climate is becoming less predictable with longer dry seasons and unpredictable rains, and our soils are getting tired. To ensure we have enough food for everyone tomorrow (food security) and to make farming a profitable business for young people like you, we must embrace new and smarter ways of farming. This lesson introduces you to these "Emerging Technologies" – powerful tools that can help us grow more food with fewer resources.
This section breaks down the five key technologies. We will look at what they are, how they work, and how they apply to our Ghanaian crops. A. Greenhouse Planting What is it? A greenhouse is a structure, often made with a wooden or metal frame and covered with transparent material like plastic (polythene) or glass. It is used to grow crops in a controlled environment. How it works: Traps Heat: The sun's radiation enters the greenhouse and warms the air and soil inside. The cover traps this heat, making the inside warmer than the outside, which is useful during cool harmattan nights. Controls Water: It protects crops from excessive rainfall, which can cause erosion and diseases. Irrigation (like drip irrigation) can be installed for precise watering. Pest & Disease Barrier: The structure and netting on the sides act as a physical barrier, preventing pests like grasshoppers and birds from reaching the crops. This reduces the need for chemical pesticides. Application to Ghanaian Arable Crops: Cereals (e.g., Maize): Not practical for growing maize to maturity due to cost and space. However, it is excellent for raising high-value, disease-free seedlings for transplanting. Legumes (e.g., Tomato, Pepper, Cowpea): Very effective for growing high-value vegetables like tomatoes and peppers year-round, protecting them from pests like the whitefly which spreads viruses. This allows farmers to sell them during the off-season when prices are high. Tubers (e.g., Yam, Cassava): Crucial for the early stages of producing clean planting materials. Yam plantlets from tissue culture are first hardened in greenhouses before being taken to the field. This protects the fragile, disease-free plants. B. Hydroponics What is it? A method of growing plants without soil. Instead, the plant roots are suspended in a nutrient-rich water solution. The name comes from Greek: *hydro* (water) and *ponos* (labour). How it works: Nutrient Solution: All the essential minerals a plant needs (Nitrogen, Phosphorus, Potassium, etc.) are dissolved in water to create a "liquid food." Root Support: The plants are held in place by an inert medium like coconut coir (husk), perlite, or rock wool, or their roots hang directly into the nutrient solution. Delivery System: The nutrient solution is pumped to the roots periodically. It is then often recirculated to save water and nutrients. Application to Ghanaian Arable Crops: Direct Application: Not practical for large-scale field crops like cassava or maize because of the high setup cost. Indirect Application & High-Value Crops: Fodder Production: Hydroponics can be used to quickly grow fodder (maize or barley sprouts) for livestock. This is very useful during the dry season when animal feed is scarce. Seedling Production: Perfect for raising healthy, strong seedlings of crops like tomato or pepper before transplanting them to the field or a greenhouse. Urban Farming: Excellent for landless youth in cities like Accra or Kumasi to grow high-value leafy vegetables (lettuce, spinach) for hotels and supermarkets. C. Tissue Culture (Micropropagation) What is it? A laboratory technique for growing whole plants from tiny pieces of a parent plant (like a piece of leaf, stem, or root tip) in a sterile, artificial nutrient medium. It is essentially a form of plant cloning. How it works (Simplified): Explant Selection: A small, disease-free piece of the desired plant (the "explant") is taken. For yams, this could be a piece of the growing tip. Sterilisation: The explant is sterilised to kill any microbes (bacteria, fungi). Inoculation: The explant is placed in a test tube or jar containing a sterile gel-like medium (agar) packed with nutrients and growth hormones. Multiplication: In the lab, under controlled light and temperature, the explant grows and multiplies into many tiny plantlets. Acclimatisation: The plantlets are carefully moved from the lab jars to soil in a greenhouse to "harden" them before they are ready for the open field. Application to Ghanaian Arable Crops: Tubers (Cassava & Yam): This is its most powerful application in Ghana. It is used to produce millions of *disease-free* planting materials. It helps farmers fight devastating diseases like Cassava Mosaic Virus and yam anthracnose. The CSIR-Crops Research Institute in Kumasi uses tissue culture for this purpose. Legumes & Cereals: Can be used to rapidly multiply a newly developed, high-yielding variety of cowpea or rice for distribution to farmers. D. Genetically Modified Organisms (GMOs) What is it? An organism (plant, in our case) whose genetic material (DNA) has been altered using genetic engineering techniques. This is done to introduce a new, desirable trait that does not occur naturally in the species. How it works: Identify Trait: Scientists identify a useful trait in another organism (e.g., a bacterium that produces a protein toxic to insects). Isolate Gene: They isolate the specific gene responsible for that trait. Insert Gene: Using laboratory methods, they insert this gene into the DNA of a crop plant, like maize. Verify: They grow the plant and confirm that it now expresses the new trait (e.g., it now produces the insect-killing protein). Application to Ghanaian Arable Crops: Cereals (Maize): *Bt Maize* is a GMO that produces a protein from the bacterium *Bacillus thuringiensis*. This protein kills stem borer insects when they try to eat the plant, reducing the need for chemical sprays. Legumes (Cowpea): In Ghana and Nigeria, scientists have developed *Bt Cowpea* (Pod Borer-Resistant Cowpea). The Maruca pod borer is a major pest that can destroy over 80% of a farmer's cowpea harvest. This GMO cowpea resists the pest, leading to much higher yields. This technology is currently being introduced to farmers in West Africa. Note: GMOs are a topic of public debate. Proponents highlight increased yields and reduced pesticide use. Opponents raise concerns about long-term safety and control of seeds by large companies. It is important to understand both sides. E. Precision Agriculture What is it? A modern farming 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. How it works (Key Tools): Data Collection (Observe): Drones with special cameras fly over a farm to create maps showing plant health. Soil sensors measure moisture and nutrient levels in different spots. GPS on tractors tracks movement and location. Data Analysis (Measure): Software analyses the data to pinpoint problems. For example, a map might show that the maize in the northeast corner of the field is yellow due to a lack of nitrogen. Targeted Action (Respond): A modern fertiliser spreader connected to a GPS can be programmed to apply more fertiliser *only* in that weak northeast corner, saving fertiliser on the healthy parts of the field. Similarly, a GPS-guided irrigation system could give more water to a dry patch. Application to Ghanaian Arable Crops: Large Commercial Farms: This technology is most common on large commercial rice and maize farms (e.g., in the Afram Plains or Northern Region). Drones: Drones are becoming more accessible. They can be used for: Scouting: Quickly checking a large rice or maize farm for pest outbreaks or weed patches. Spraying: Applying pesticides or liquid fertilisers more efficiently and safely than carrying a knapsack sprayer. GPS: Simple GPS apps on a smartphone can help farmers accurately measure their farm size, which is important for calculating the correct amount of seed and fertiliser to buy.
Guided Practice (With Solutions)
Instructions: Work in pairs. Read each question carefully, discuss your answer with your partner, and then we will discuss as a class.
Question 1 (Recall & Understanding): A yam farmer in the Bono Region, Nana Akua, is facing two major problems: (a) Most of her yam planting materials (yam setts) are infected with a virus, leading to low yields. (b) During the dry season, it is very difficult to grow vegetables to sell for extra income because of the lack of water.