M2(W) / M3(W) / M6W
24
Examples for NORMAL spread patterns.
Spread width
:
18
metres
Quantity :
250
Kg/Ha
Test with test trays
OPTIMUM
spread pattern
TILT ANGLE:
+3
°
Tendency
Optimum overlap
From the tramline in which you drive the spread pattern forms a ”TRIANGLE”, ensuring a correct overlap.
The fertiliser in this example is as a minimum spread to next tramline – often wider.
The variation coefficient (Vk) is an expression of the ”quality” of the spread pattern.
In this example the VK is of optimum size at 18 metres – with a Vk of 2,9 %
The variation coefficient indicates the ability of the spreader to distribute the
fertiliser evenly over the field. If the spread width is either too large
(large overlap)
, or
too small
(small overlap)
– it will influence negatively the Vk and thus the fertiliser
distribution.
One of the big BOGBALLE strengths is that the 4-double overlap of the machine
ensures a good flexibility – say a minimum Vk – over a very very large spectrum.
(In this example from 6 to 21 metres)
.
This means in practice that the machine is able to absorb deviations in the distance
of tramlines, deviations in PTO speed and to a certain degree – deviations from tilt
angle, without influencing the distribution of the fertiliser (Vk).
As main rule the below scale is used internationally as evaluation basis:
Vk
<
5 %
Very good
Vk
>
5 %
< 10 %
Good
Vk
>
10 % < 15 %
Acceptable
Vk >
15%
<
20% Not
acceptable
>20 might be visible in the crop
Sprede- og overlapningskurve
0
5
10
15
20
25
30
24
19
14
9
4
4
9
14
19
24
M e te r
Gram
Spredekurve
Overlap 18m
Variationskoefficient
2,9%
0,0%
5,0%
10,0%
15,0%
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Afs tand m e lle m k øre s por
Spread- and Overlap pattern
Variation Coefficient
Distance between tramlines