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Determining the Effective
Spreading Width
The effective width is used to determine the uniform
distribution of the material.
Note:
The spreading width range is 0.9 m (3 ft) up
to 7.6 m (25 ft).
1.
After the spreader pattern is correctly adjusted,
evaluate the amount of material in the center
graduated measuring cylinder.
2.
Locate the two tubes, one each side of center,
that contain half the measured amount of
the material that you observed in the center
graduated cylinder.
3.
Go to the two corresponding pans. Starting
from the outer edge, measure and record the
distance between left pan, through the center
pan, to the outer edge of the right pan.
Note:
This measurement is the effective
spreading width.
Calculating the Application Rate
1.
Determine the amount of product to be applied.
2.
Determine the calibration course
A.
Determine the amount of product to be
spread per 93 m
recommended rate from the
Charts (page 34)
manufacturer's label as a guide.
B.
Determine a course length by dividing by
the effective spread width.
For example, if the effective width is 1.8
m (6 ft), then the calibration course length
equals 51 m (167 ft).
Course Length
93 m
2
(1,000 ft
1.8 m (6 ft)
C.
The calibration course is 1.8 m (6 ft) by 51
m (167 ft).
D.
Measure and visibly mark the course length.
Make sure to allow ample distance before
the starting marker to ensure the spreader
is at full speed when crossing the first mark
of the course.
3.
Set the appropriate gate dial setting (refer to
the
Spreading Charts (page 34)
starting point).
4.
Add material to the hopper (for example, 11.3
kg (25 lb) was added).
2
(1,000 ft
2
). Use the
Spreading
section or the product
2
)
=
51 m (167 ft)
section as a
5.
Drive the spreader over the calibration course
while applying the material.
6.
Empty the remaining material of the hopper into
a clean bucket.
7.
Weigh the bucket containing the material and
record the weight. Pour the contents back into
the hopper and then weigh the empty bucket.
Subtract these two amounts to determine the
amount of material remaining in the hopper (for
example, 9 kg (20 lb) remains.)
8.
Subtract the amount remaining in the hopper
(step 7) from the amount originally added (step
4); the result is the amount applied to the course.
Amount Applied
11.3 kg (25 lb) – 9 kg (20 lb)
For this example, 2.3 kg (5 lb) was applied to
93 m
2
(1,000 ft
9.
If necessary, adjust the rate dial to achieve the
recommended amount to be applied and repeat
the procedure. Once the correct application rate
is achieved, repeat this procedure an additional
time to verify the results.
Note:
Designate a new calibration course each
time, so the turf is not damaged.
29
=
2.3 kg (5 lb)
2
).
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