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? 6.3 Identify TWO structural problems on the sprinkler shown below that can negatively influence efficiency. 6.4 Name a device that a farmer can use to measure the evaporation tempo in a maize field. 6.5 Draw a labelled freehand sketch of a French water drainage system. Marks will be allocated as follows: Design 1 Drawing 1 Labels 4 6.6 List FIVE items that should never be disposed of in a household septic tank system. 6.7 Give THREE reasons why it is essential for a farmer to know how to determine the flow rate in a water pipe delivery system. 6.8 The picture below shows a centre-pivot irrigation system. 6.8.1 Name THREE advantages of centre-pivot irrigation systems. 6.8.2 Which THREE elements are built into the design of a centre-pivot irrigation system to ensure uniform distribution of water along the whole system?

NSC Agricultural Technology Irrigation control systems: 6.1 Name FOUR important factors

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

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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? 6.... show full transcript

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: Different crops have varying water requirements.
Amount of water available: Determine how much water can be supplied for irrigation.
Type of irrigation system: Choose between surface, drip, sprinkler, etc. based on needs.
Pump type: Identify the appropriate pump for the irrigation system's requirements.

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 to promote healthy growth.
Prevent overwatering to avoid water wastage and damage to the plants.
Allow the soil to dry out in between watering to encourage healthy root development.

Step 3

Identify TWO structural problems on the sprinkler shown below that can negatively influence efficiency.

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Answer

Springs can lose tension or break: This results in uneven water distribution.
Nozzles can be blocked: Blocked nozzles prevent proper water flow, reducing efficiency.

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) is commonly used for this purpose.

Step 5

Draw a labelled freehand sketch of a French water drainage system.

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Answer

A labelled diagram should include elements like Trench/Furrow, Permeable membrane, and a Perforated pipe/Pipe.

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 to ensure accurate application rates.
For effective scheduling of irrigation to match water supply with crop needs.
To prevent over-utilization of the water source and promote sustainable practices.

Step 8

Name THREE advantages of centre-pivot irrigation systems.

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Answer

No labour needed to shift the pipes/system: Automation reduces manual effort.
One-man operation: A single operator can manage the entire system.
Automated watering system/scheduling: This allows for precise control over irrigation.

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 system?

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Answer

Distribution pattern of the sprayers to ensure consistent coverage.
Nozzle opening diameter must increase proportionally further from the centre to maintain distribution rates.
Spacing between sprayers must be optimized based on the flow rate and water delivery system.

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

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

Name FOUR important factors that must be considered before deciding on a relevant irrigation method.

What are the main goals with irrigation scheduling?

Identify TWO structural problems on the sprinkler shown below that can negatively influence efficiency.

Name a device that a farmer can use to measure the evaporation tempo in a maize field.

Draw a labelled freehand sketch of a French water drainage system.

List FIVE items that should never be disposed of in a household septic tank system.

Give THREE reasons why it is essential for a farmer to know how to determine the flow rate in a water pipe delivery system.

Name THREE advantages of centre-pivot irrigation systems.

Which THREE elements are built into the design of a centre-pivot irrigation system to ensure uniform distribution of water along the whole system?

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