Seed-flow adjustment system

A distribution tower for distributing particulate material, said distribution tower comprising:

• an upright conduit for pneumatically conveying particulate material downstream in a primary stream toward an upper end of said conduit;
• a distribution head at the upper end of said conduit, wherein said distribution head comprises a plenum chamber for receiving the primary stream of particulate material from said conduit, and wherein said distribution head further comprises a plurality of discharge outlets for directing particulate material out of said plenum chamber, wherein said distribution head is configured to split the primary stream into a plurality of secondary streams, wherein each of the secondary streams is discharged from said distribution head via one of said discharge outlets;
• a flow adjustment system configured to adjust, upstream from the discharge outlets, a distribution of particulate material within the secondary streams;
• and
• a control system for controlling operation of said flow adjustment system.

A method of distributing particulate material through a distribution tower, said method comprising the steps of:

• (a) pneumatically conveying particulate material in a primary stream upward through an upright conduit to a plenum chamber of a distribution head;
• (b) splitting the particulate material of the primary stream into a plurality of secondary streams that each exit the plenum chamber through a discharge outlet;
• and
• (c) adjusting, via a flow adjustment system controlled by a control system, a distribution of the particulate material among the secondary streams without completely cutting off the flow of any of the secondary streams through their respective discharge outlet.