Tume has already over ten years experience of wide
working width seed only and combined seed and
fertiliser drills. As example of wide drill models of
those days was Tume Maximaster of 8 m working
width.
Already then Tume was ahead of its time. In the
combined seed and fertilizer versions also the granulated fertiliser was by air assistance distributed and
placed besides the seeds. This by Tume developed
seed and fertilizer technology was then widely used in
seed and fertilizer drills of several drill manufacturers.
Tume was not completely satisfied to the air assisted sowing technology. Air assisting was only
necessarily needed to transport the seeds and fertililiser to the foldable outer sections of large working
width drills and keep the transport width within the
legal three meters. However: Air assisting brings
no add value or real benefits to sowing or fertilising itself – vice versa:
• air condenses water, specially transporting and
distributing fertilizer is very challenging
• for bigger working widths air flow dividers are
needed > less accuracy in metering
• air assisting requires complicated and expensive
technical solutions
– PTO drive or constant hydraulic power from
tractor
• more complicated and difficult to operate – re-
quires the operator a lot of learning and concen
tration
• wearing and blocking air hoses, too many parts
and components unnecessary for the seed to germinate and grow
• air blow is removing fine soil away around the
placed seeds causing uneven germinating
– stabile germinating conditions are disturbed
– air blow from the coulter seed tube causes un
even sowing depth of “jumping seeds”
• delays in seed and fertilizer flows in headland and
corner turns cause over and under lapping
• in practice the tractor engine must be operated
with full revs to maintain enough air flow to prevent blockages. This causes extra fuel consumption
• pneumatic drills are mainly high and their hoppers
are difficult to fill up
• air – assisted drills are noisy
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