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 include:
Mechanical drive
Hydraulic (Hydrostatic) drive
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 from corrosion is by galvanizing, which coats the metal with a layer of zinc.
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 effective and uniform irrigation.
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, which allows for automatic control of the irrigation system based on pre-set timings.
Step 5
6.2 Give THREE reasons for the use of water scheduling.
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Three reasons for using water scheduling are:
To save water by ensuring it is used efficiently.
To prevent over irrigation, which can lead to crop damage and waste.
To optimize the crop variety depending on their specific 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 used to measure crop evapotranspiration include:
Tensiometer/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
The components of the waste-water management system are:
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 system is to break down the solid materials present in the sewage, facilitating the treatment and purification of the waste water.
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:
Ensuring it is not located near boreholes or drinking water installations.
Placing it a suitable distance from the house.
Avoiding locations near high traffic areas.
Not situating it near where people eat, wash, or work regularly.
Keeping it away from flood-prone areas.
Ensuring no leaks are present.
Step 10
6.5 Identify the water drainage system shown below.
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Answer
The water drainage system shown is a channel drain or furrow drain.
