The picture below shows a centre-pivot irrigation system - NSC Agricultural Technology - Question 6 - 2020 - Paper 1
Question 6
The picture below shows a centre-pivot irrigation system.
6.1.1 The irrigation system above requires force to drive the wheels. Name TWO of these drive methods.
6.... show full transcript
Worked Solution & Example Answer:The picture below shows a centre-pivot irrigation system - NSC Agricultural Technology - Question 6 - 2020 - Paper 1
Step 1
6.1.1 Name TWO of these drive methods.
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Answer
The two drive methods for the irrigation system can be:
Mechanical
Electrical
Step 2
6.1.2 Name a method to protect the metal parts of the irrigation system against corrosion.
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Answer
A method to protect the metal parts is through galvanizing.
Step 3
6.1.3 Give a reason why the water pressure is kept constant from the centre of the pivot to the end of the pivot.
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The water pressure is kept constant to ensure that the amount of water administered to the crop is equal from the centre of the land to the outer edge, allowing for an equal distribution of water.
Step 4
6.1.4 Name a device that a farmer can install to automatically switch the system on or off, as required.
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A farmer can install an irrigation timer or regulator to automatically switch the system on or off.
Step 5
6.2 Give THREE reasons for the use of water scheduling.
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Three reasons for water scheduling include:
To save water by avoiding unnecessary irrigation.
To prevent over or under irrigation, ensuring optimal crop health.
To manage water application based on crop variety and water requirements.
Step 6
6.3 Name TWO types of equipment that can be used to measure crop evapotranspiration effectively.
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Answer
Two types of equipment for measuring crop evapotranspiration are:
Tensiometer or Neutron Moisture Probe.
Evaporation pan.
Step 7
6.4.1 Identify A, B, C, D and E shown in the diagram above.
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Answer
Identification:
A – Inlet pipe
B – Scum/Foam
C – Sewage water/Liquid
D – Sludge/Solid waste
E – Outlet pipe
Step 8
6.4.2 Describe the main function of the bacteria that are present in the system.
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The main function of the bacteria in the waste-water management system is to break down solid materials.
Step 9
6.4.3 Explain the precautionary measures that have to be taken into consideration when a septic tank is built.
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Precautionary measures include:
Not building near boreholes or drinking water installations.
Ensuring it is a suitable distance away from the house.
Avoiding areas with high traffic to reduce contamination risks.
Ensuring it is not built where people eat, wash, or work regularly.
Not installing it inside the flood area of a river.
Step 10
6.5 Identify the water drainage system shown below.
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The water drainage system shown is a channel drain or furrow drain.
