Lesson Notes By Weeks and Term v4 - SHS 1
AGRICULTURAL MACHINERIES
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AGRICULTURAL MACHINERIES
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Subject: Agricultural Science
Class: SHS 1
Term: 2nd Term
Week: 8
Grade code: 2.1.3.LI.3
Strand code: 1
Sub-strand code: 3
Content standard code: 2.1.3.CS.1
Indicator code: 2.1.3.LI.3
Theme: NEW DAWN AGRICULTURE
Subtheme: AGRICULTURAL MACHINERIES
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*Commentary:* This first step helps students recall and compare the basic characteristics of the two systems before moving on to calculations. It shows that there is a trade-off: Furrow is cheap to start but wasteful and requires a lot of work, while Drip is expensive to start but efficient and saves labour later. Question 2: Explaining a Key Concept
*Commentary:* This first step helps students recall and compare the basic characteristics of the two systems before moving on to calculations. It shows that there is a trade-off: Furrow is cheap to start but wasteful and requires a lot of work, while Drip is expensive to start but efficient and saves labour later.
Question 2: Explaining a Key Concept
Explain why drip irrigation is considered more water-efficient than sprinkler irrigation, especially during a hot and windy day in Northern Ghana.
Solution & Commentary: Drip Irrigation: Water is delivered directly to the soil at the base of the plant. There is almost no exposure to the air, so water loss through evaporation (water turning to vapour from the heat) is minimal. Sprinkler Irrigation: Water is sprayed into the air and has to travel before landing on the ground. On a hot, windy day, a significant portion of this water will evaporate in the air and be blown away by the wind (wind drift). It never even reaches the plant's roots. Conclusion: Therefore, drip irrigation delivers a much higher percentage of the pumped water directly to the crop, making it far more efficient.