A planter system for planting seeds and spraying fluidincludes a seeder assembly including a seed tube, a seed meterconfigured to dispense a seed into the seed tube, and a conveyorapparatus configured to carry the seed through the seed tube.The planter system also includes a sensor configured to transmita detection signal upon detection of the seed passing adetection location. The planter system also includes a controlsystem configured to determine a travel time of the seed fromthe detection location to a furrow based on a baseline drop timefor the seed, a baseline travel speed of the seeder assembly,and an operating travel speed of the seeder assembly. Thecontrol system is configured to transmit a control signal to avalve coupled to a nozzle assembly based on the travel time andthe detection signal to spray the fluid on or adjacent the seed.
