Abstract
ABSTRACT AN experimental pneumatic downpressure system was designed to be interactive with the depth control system on a no-tillage planter. The interactive system uses position control monitoring and modulation of air flow to and from automotive pneumatic shock absorbers on individual furrow opener units. Automatic depth control is achieved by vertical force adjustments which occur for changing resistance to residue and soil cutting by a triple-disc furrow opener. The system response to dynamic pertubations was affected by the system pressure and somewhat by travel velocity.
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