A planter system for planting seeds and dispensing a fluid includes a seeder assembly including a seed meter configured to dispense a group of seeds through a seed tube, a nozzle assembly configured to dispense the fluid in response to receiving a control signal, and a sensor configured to transmit detection signals upon detection of the first and last seeds passing through the seed tube. The planter system further includes a control system communicatively coupled to the sensor to receive the detection signals from the sensor and identify a trigger time based on the detection time of the first seed, the detection time of the last seed, or a time between the detection times. The control system transmits the control signal to the nozzle assembly based on a number of seeds in the group and the trigger time to apply the fluid on or adjacent the group of seeds.