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6 Adjusting the fertiliser spreader
6.1 General
Values provided in the spreading charts are derived from practical tests in the
manufacturer's purpose built fertiliser spreader research centre. Settings are
obtained using fertiliser in perfect condition from each respective manufacturer
and spread over the stated spreading width.
We would particularly emphasise that physical characteristics of fertiliser can
vary, even within the same type and brand, due to differences in size of granu-
les, density, surface texture, specific weight and quality of granules, etc.
These variations can influence spreading characteristics quite markedly, which
result in
differences in the fertiliser application rates
as well as
changes in
spread patterns
predicted in the spreading charts, therefore making it neces-
sary to recalibrate the fertiliser.
The data provided in the spreading charts can only be used as a guideline. To
ensure greater accuracy the unit should be recalibrated for application rate, and
the spread pattern should be checked over the desired width with the help of
the practical test kit, every time fertiliser is changed, even when using different
bags of the same fertiliser.
We suggest the use of only quality fertiliser from well-known suppliers, prefe-
rably those fertilisers listed in the spreading charts. If you need to use fertiliser
not listed, please contact us.
Spreading of Urea
This highly concentrated nitrogen fertiliser has a wide variation of quality and
particle sizes, due to the great number of importers handling this product.
It is therefore essential to recalibrate the unit every time this fertiliser is used.
Also note that Urea is very susceptible to wind variations and moisture absorb-
tion.
Pay special attention when setting the spreader. Even a very small error in set-
ting can result in a large change in spread pattern.
We must stress that no liability can be accepted for consequential losses
or damages due to spreading errors.
A
TTENTION
