Application Rate
Page
18
05/14
9. Weigh the sample collected and multiply
the answer by 20 if the full number of
handle turns for 1/20
th
of a hectare was
used.
Fig. G24. Weighing the sample.
10. Increase or reduce the rear door setting
to increase or reduce the application rate.
Example 1
Urea is to be spread at an application
rate of 80kg/ha. The bout width for this
particular product has been estimated at 20
metres. The bulk density of the urea has
been checked and measures 0.76
tonnes/cubic metre. Using the Rate Chart
from the rear of the manual the closest chart
applicable using the lowest gearbox ratio
possible is the first chart on page 50.
Fig. G25 Rate Chart example.
The chart shows an estimated rear door
opening of 62 mm. After setting the rear door
to this setting the jockey wheel was rotated to
prime the feed chain and discharge area. The
collection bags or tray was emptied and
replaced ready for the actual test. The jockey
wheel was rotated 19.6 turns as per table G27
on page 18 for a 1/20
th
of a hectare test at a
20 metre bout width.
The total sample was then weighed and
multiplied by 20 to obtain the application rate.
Eg. Sample weight 3.78kg x 20 = 75kg/ha.
The door setting could be opened by a
couple of millimetres to increase the rate to
the required 80 kg/ha.
Example 2
Lime with a bulk density of 1.09
tonnes/cubic metre is to be spread at a 10
metres width at a rate of 1600kg/ha. The best
gearbox ratio that can be used for this product
from the Rate Chart is high ratio as per the
chart on page 71 at 1.1 t/cubic m.
The chart suggests a door opening of 95
mm. After priming, cleaning and replacing the
calibration trays or tarp, the jockey wheel was
rotated 1/10
th
of 39.1 turns because the
application rate was above 500kg/ha. This
means that instead of 39.1 turns, the wheel
was rotated 3.9 turns. It also means that
instead of multiplying the sample weight by 20
it was multiplied by 200 e.g. (10 x 20 =200).
In this example let us assume the total
sample weight was 8.42kg.
8.42 x 200 = 1684kg/ha.
In this case it would be best to lower the
rear door slightly and retest.
Gear Box... Low
RATE CHART KG. PER HA.
Material Weight Per ltr
0.75
Figures in body of ch
W idth
8
10
12
14
16
18
20
22
24
Rat e
-
-
-
-
-
-
-
-
-
20
No
No
No
No
No
No
N o
No
No
30
No
No
No
No
No
No
23
26
28
40
No
No
No
No
25
28
31
34
37
50
No
No
23
27
31
35
39
43
47
60
No
23
28
33
37
42
47
51
56
70
No
27
33
38
44
49
55
60
66
80
25
31
37
44
50
56
62
69
75
90
28
35
42
49
56
63
70
77
84
100
31
39
47
55
62
70
78
86
94
110
34
43
51
60
69
77
86
94
103
120
37
47
56
66
75
84
94
103
112
130
41
51
61
71
81
91
101
112
122
140
44
55
66
76
87
98
109
120
131
150
47
59
70
82
94
105
117
129
140
Содержание 5030 Series
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