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 required to drive the wheels of 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
A 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 that the quantity of water that is administered to the crop is equal from the centre of the land to the outer edge. This promotes 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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Answer
A farmer can install an irrigation timer or regulator to automatically switch the system on or off as needed.
Step 5
6.2 Give THREE reasons for the use of water scheduling.
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Answer
Three reasons for the use of water scheduling are:
To save water by avoiding excess usage.
To prevent over or under irrigation, thus ensuring optimal crop growth.
To manage water timings according to the crop's needs.
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 used to effectively measure crop evapotranspiration are:
Tensiometer or Neutron Moisture Probe (thermal and satellite imaging).
