US Patent 11564344 Particle delivery system of an agricultural row unit

A particle delivery system of an agricultural row unit includes a first particle disc configured to meter particles and a second particle disc configured to receive the particles from the first particle disc and to transfer the particles toward a trench in soil. The particle delivery system includes a vacuum source configured to reduce air pressure within a first vacuum passage to couple the particles to one or more first apertures of the first particle disc. The vacuum source is also configured to reduce air pressure within a second vacuum passage to couple the particles to one or more second apertures of the second particle disc. A rotation rate of the first particle disc is controllable to establish a particle spacing between the particles within the trench. A rotation rate of the second particle disc is controllable to expel the particles at a particle exit speed.