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 The irrigation system above requires force to drive the wheels. Name TWO of these drive methods.
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Answer
The two drive methods for the irrigation system are:
Mechanical
Hydraulic (Hydrostatic)
Step 2
6.1.2 Name a method to protect the metal parts of the irrigation system against corrosion.
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Answer
One effective method to protect the metal parts of the irrigation system against corrosion is 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 an even distribution of water across the entire area being irrigated, which helps in preventing over or under-watering in different parts of the field.
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 irrigation system on or off as required.
Step 5
6.2 Give THREE reasons for the use of water scheduling.
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Three reasons for the use of water scheduling include:
To save water effectively.
To prevent over-irrigation, which can lead to water wastage.
To ensure that crops receive adequate moisture at their growth stages.
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 that can be used to measure crop evapotranspiration effectively are:
Tensiometer/Neutron Moisture Probe (Thermal and satellite imaging).
Evaporation pan.
Step 7
6.4.1 Identify A, B, C, D and E shown in the diagram above.
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Answer
Identifications:
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 present in the system is to break down the solid materials, aiding in the treatment of waste.
Step 9
6.4.3 Sewage water leaking into rivers and dams can harm humans and animals. Explain the precautionary measures that have to be taken into consideration when a septic tank is built.
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Precautionary measures for building a septic tank include:
Not locating it near boreholes or drinking water installations.
Ensuring it is a suitable distance away from the house.
Avoiding areas with high traffic.
Not placing it near places where people eat or wash regularly.
Avoiding the flood area of a river.
Not positioning it uphill from settlements.
Step 10
6.5 Identify the water drainage system shown below.
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Answer
The water drainage system shown is identified as a channel drain or furrow drain.
