Fertiliser Equipment Performance Assessment

The spatial coefficient of variation (CV) describes how evenly fertiliser is applied.
What is the recommended maximum CV for nitrogen-based fertilisers? *

5%

15%

25%

35%

95%

What is the maximum recommended CV for other types for fertiliser? *

5%

15%

25%

35%

95%

Excessive variation can have a negative effect on: *

Crop performance

Pasture performance

Profitability

the environment

All of the above

Excessive variation can increase the risk of leaching. *

True

False

Which of the following affect the spread pattern of a broadcast fertiliser applicator? *

shape and density of particles

evenness of particles in a batch

wind speed and direction

machine travel speed

the throw speed

machine discharge rate

Placement fertiliser machines include *

Oscillating spouts

Drills

Planters

Side-dressers

The same BATCH of fertiliser can spread differently when the weather changes *

True

False

Which of the following control the Application Rate of a placement machine? *

Machine travel speed

Machine alignment – horizontal axes

Discharge door opening

Roller condition

Duct design and settings

Fan speed

Drop tube design and condition

Which or the following control the Spread Pattern of a placement machine? *

Machine travel speed

Machine alignment – horizontal axes

Discharge door opening

Roller condition

Duct design and settings

Fan speed

Drop tube design and condition

Why can blended fertiliser products spread nutrients unevenly if a wide bout width is chosen? *

The different fertilisers stick together

Their particles have different densities and shapes

They pass through the metering system at different speeds

Fertiliser ballistics start to become significant between *

10-20 m/s

20-30 m/s

30-40 m/s

40-50 m/s

If you can see striping in a crop as a result of poor fertiliser application: *

the CV is 20% and yield reduction is 20%

the CV is 20% and the yield reduction is 40%

the CV is 40% and the yield reduction is 20%

the CV is 40% and the yield reduction is 40%

If CV increases by two times, the yield loss increases by four times *

True

False

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