6.1 Name FOUR important factors that must be considered before deciding on a relevant irrigation method - NSC Agricultural Technology - Question 6 - 2021 - Paper 1
Question 6
6.1 Name FOUR important factors that must be considered before deciding on a relevant irrigation method.
6.2 What are the main goals with irrigation scheduling?
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Worked Solution & Example Answer:6.1 Name FOUR important factors that must be considered before deciding on a relevant irrigation method - NSC Agricultural Technology - Question 6 - 2021 - Paper 1
Step 1
Name FOUR important factors that must be considered before deciding on a relevant irrigation method.
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Answer
Type of crop that must be irrigated.
Determine the amount of water that is available.
Type of irrigation system.
Type of pump.
Step 2
What are the main goals with irrigation scheduling?
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Answer
To apply adequate water to the root zone of the plant.
Prevent overwatering.
Allow the soil to dry out in between watering.
Step 3
Identify TWO structural problems on the sprinkler shown below that can negatively influence efficiency.
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Answer
The springs can lose tension or break, affecting functionality.
The nozzles can become blocked, leading to uneven water distribution.
Step 4
Name a device that a farmer can use to measure the evaporation tempo in a maize field.
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Answer
Evaporation pan or Class A evaporation pan.
Step 5
Draw a labelled freehand sketch of a French water drainage system.
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Answer
A well-labeled sketch includes:
Design: French drainage system layout.
Drawing: Accurate representation of the system's components like perforated pipes and gravel.
Labels: Clearly label each part: 'Permeable membrane', 'Perforated pipe', 'Gravel/Stone'.
Step 6
List FIVE items that should never be disposed of in a household septic tank system.
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Answer
Cigarette butts.
Sanitary pads/towels.
Detergents.
Fats and oils.
Plastics.
Step 7
Give THREE reasons why it is essential for a farmer to know how to determine the flow rate in a water pipe delivery system.
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Answer
For correct calibration of the sprayers.
For effective scheduling of irrigation.
To prevent the overutilization of the water source.
Step 8
Name THREE advantages of centre-pivot irrigation systems.
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Answer
No labour needed to shift the pipes/system.
One-man operation.
Automated watering system/scheduling.
Step 9
Which THREE elements are built into the design of a centre-pivot irrigation system to ensure uniform distribution of water along the whole length of the system?
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Answer
Distribution pattern of the sprayers.
Nozzle opening diameter must increase proportionally further from the centre for higher application rate.
Spacing between sprayers must decrease proportionally further from the centre.
