Study the picture of a centre-pivot irrigation system below and answer the questions that follow. 6.1.1 State TWO advantages of using this irrigation system. 6.1.2 Name TWO communication devices that a farmer can use to effectively control the system. 6.1.3 Name TWO tips a farmer must consider before choosing the type of fertiliser to apply through a centre-pivot irrigation system. 6.2 Study the two water pumping methods below and answer the questions that follow. A B 6.2.1 When would a farmer prefer pump A over pump B? 6.2.2 List THREE factors to consider when choosing a new pump for an irrigation field. 6.2.3 Give THREE reasons why PVC pipes are preferred over steel pipes to supply water to an irrigation system. 6.2.4 The water source in picture A has a volume of 72 000 litres. The pump has a pump capacity of 120 ℓ/min. Calculate the time it will take to empty the water source. Show ALL calculations. 6.3 Name TWO types of drainage systems that can be used to remove excess water around the buildings of a dairy farm. 6.4 Name TWO different water purification methods that can be used to purify brackish water. 6.5 Study the image of a home sewage water treatment system below and answer the questions that follow. 6.5.1 Explain the construction and working of the distribution field that is connected to the septic tank. 6.5.2 Give TWO reasons why a distribution field should NOT be built near drinking water installations or boreholes. 6.6 Name TWO instances where VRT (variable rate technology) can be used in precision farming.

NSC Agricultural Technology Water pumps: Study the picture of a centre-pi

Study the picture of a centre-pivot irrigation system below and answer the questions that follow - NSC Agricultural Technology - Question 6 - 2024 - Paper 1

Question 6

Study the picture of a centre-pivot irrigation system below and answer the questions that follow. 6.1.1 State TWO advantages of using this irrigation system. 6.1.2... show full transcript

Worked Solution & Example Answer:Study the picture of a centre-pivot irrigation system below and answer the questions that follow - NSC Agricultural Technology - Question 6 - 2024 - Paper 1

Step 1

State TWO advantages of using this irrigation system.

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Answer

Time Saving: The centre-pivot irrigation system allows for efficient water application across large areas, reducing the time required for watering.
Irrigation of Large Lands: This system can irrigate extensive fields uniformly, making it suitable for large-scale agricultural operations.

Step 2

Name TWO communication devices that a farmer can use to effectively control the system.

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Answer

Cell Phone: Allows farmers to monitor and control the irrigation system remotely.
Tablet: Can be used for controlling system settings and assessing irrigation data on-the-go.

Step 3

Name TWO tips a farmer must consider before choosing the type of fertiliser to apply through a centre-pivot irrigation system.

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Answer

Fertiliser Composition: Choose fertilisers with a high nutrient content to maximize effectiveness.
Particle Size: Avoid fertilisers with large particles that may clog the irrigation system.

Step 4

When would a farmer prefer pump A over pump B?

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Answer

A farmer would prefer pump A when there is no electrical power available to operate pump B, as pump A requires only manual operation and can pump larger volumes efficiently.

Step 5

List THREE factors to consider when choosing a new pump for an irrigation field.

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Answer

Pressure Requirements: Ensure the pump can meet the pressure required for the specific irrigation method.
Capacity of the Pump: The pump should have a capacity suitable for the size of the irrigation area.
Durability of the Pump: Opt for pumps that have a proven track record of reliability and longevity.

Step 6

Give THREE reasons why PVC pipes are preferred over steel pipes to supply water to an irrigation system.

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Answer

Corrosion Resistance: PVC does not rust, ensuring longevity and reducing maintenance costs.
Lightweight: PVC pipes are easier to handle and install compared to heavier steel pipes.
Flexibility: PVC is flexible, making it easier to work with in various terrains compared to rigid steel.

Step 7

Calculate the time it will take to empty the water source.

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Answer

To find the time to empty the water source, use the formula:

ext{Time} = \frac{\text{Volume of water}}{\text{Flow rate}} = \frac{72 000 \text{ litres}}{120 \text{ litres/min}} = 600 \text{ minutes}

Thus, it will take 600 minutes to empty the water source.

Step 8

Name TWO types of drainage systems that can be used to remove excess water around the buildings of a dairy farm.

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Answer

Channel Drain: A trench-like system that collects and directs excess water away from buildings.
Slope Drain: Utilizes the natural slope of the land to facilitate water drainage.

Step 9

Name TWO different water purification methods that can be used to purify brackish water.

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Distillation: Involves heating water to create steam and then condensing it to separate impurities.
Reverse Osmosis: Uses a semipermeable membrane to remove contaminants from water.

Step 10

Explain the construction and working of the distribution field that is connected to the septic tank.

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The distribution field consists of a narrow trench that is filled with a bed of washed gravel or crushed stone, where perforated or open joint pipes are placed. The discharge from the septic tank is directed into this trench, allowing wastewater to disperse into the surrounding soil, which aids in natural filtration and absorption.

Step 11

Give TWO reasons why a distribution field should NOT be built near drinking water installations or boreholes.

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Answer

Contamination Risk: Distribution fields can introduce harmful pathogens and chemicals to drinking water supplies.
Environmental Hazard: The proximity can lead to waterborne diseases due to the infiltration of contaminated water into groundwater sources.

Step 12

Name TWO instances where VRT (variable rate technology) can be used in precision farming.

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Answer

Precision Planting: Adjusting seed placement and depth based on soil variability to enhance crop yield.
Application of Fertilisers/Lime: Applying nutrients variably across fields based on soil nutrient levels to optimize growth.

Study the picture of a centre-pivot irrigation system below and answer the questions that follow - NSC Agricultural Technology - Question 6 - 2024 - Paper 1

Worked Solution & Example Answer:Study the picture of a centre-pivot irrigation system below and answer the questions that follow - NSC Agricultural Technology - Question 6 - 2024 - Paper 1

State TWO advantages of using this irrigation system.

Name TWO communication devices that a farmer can use to effectively control the system.

Name TWO tips a farmer must consider before choosing the type of fertiliser to apply through a centre-pivot irrigation system.

When would a farmer prefer pump A over pump B?

List THREE factors to consider when choosing a new pump for an irrigation field.

Give THREE reasons why PVC pipes are preferred over steel pipes to supply water to an irrigation system.

Calculate the time it will take to empty the water source.

Name TWO types of drainage systems that can be used to remove excess water around the buildings of a dairy farm.

Name TWO different water purification methods that can be used to purify brackish water.

Explain the construction and working of the distribution field that is connected to the septic tank.

Give TWO reasons why a distribution field should NOT be built near drinking water installations or boreholes.

Name TWO instances where VRT (variable rate technology) can be used in precision farming.

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