Grass seed is prone to bridging in seed tanks. The Bourgault 3165, Morris 6130, and the Flexi-coil 1720 were examined to determine what, if any, modifications would be required to improve grass seeding performance. Initial testing revealed that all the air seeders required some form of agitation or improved agitation in the seed tank to prevent light grass seed's natural tendency to bridge over meter openings, which prevents seeding uniformity. PAMI developed a modified agitator for each air seeder and tested the seeders for uniformity in metering and distribution of seed through the system and to the openers with the agitators. Less time was available to develop a suitable agitator for the Flexi-coil machine.
Uniform flow is extremely difficult to maintain with some grass seeds.
Agitator design, seed tank shape, meter opening design, and air flow speed all play a role in accurate seed metering and distribution. A one dollar charge applies.