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 Drainage 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: Understand the specific water needs of the crops.
Amount of water available: Assess the water sources and their reliability.
Type of irrigation system: Different systems (drip, sprinkler) will affect efficiency and costs.
Pump type: Determine the kind of pump that will efficiently supply the necessary water.

Step 2

What are the main goals with irrigation scheduling?

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Answer

Adequate water supply: Ensure the root zone receives sufficient water.
Prevent overwatering: Avoid waterlogging and waste of resources.
Soil moisture management: Allow the soil to dry appropriately between watering to promote healthy plant growth.

Step 3

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

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Answer

Tension loss in springs: This can prevent the sprayer from operating effectively.
Blocked nozzles: Clogged nozzles can lead 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

An evaporation pan (or Class A evaporation pan) is a common tool used to measure evaporation rates.

Step 5

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

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Answer

The diagram should include a perforated pipe or pipe, with surrounding gravel/stone for drainage, and a permeable membrane to protect against soil intrusion.

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 even and adequate watering.
Effective scheduling of irrigation: To optimize water use and timing.
Prevent overutilization of the water source: To ensure sustainability of water resources.

Step 8

Name THREE advantages of centre-pivot irrigation systems.

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Answer

Labour efficiency: Requires less manual work to manage the irrigation system.
One-man operation: Can be operated by a single person, saving time and resources.
Automated scheduling: Enables precise irrigation timing and resource management.

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: Ensures even water coverage over the area.
Nozzle opening diameter: Adjustable to ensure proportional distribution based on field conditions.
Spacing between sprayers: Carefully calculated to maintain uniform water flow from the center outward.

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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