Abstract: An agricultural device includes a boom having a supply line for transporting liquid product and nozzles along the boom, each nozzle operatively connected to the supply line. A liquid product supply is connected to the supply line for supplying the liquid product to be sprayed. A pressure regulation unit includes a nozzle controller for controlling opening and closing of a nozzle. A speed detector measures speed of the device. The pressure regulation unit and/or the nozzle controller calculate nozzle timing data for each nozzle including a spraying frequency and a maximum closing time. The speed is provided to the pressure regulation unit and/or the nozzle controller for calculation of nozzle operation data. The nozzle controller operates each of the nozzles based on the calculated nozzle timing data and the maximum closing time is not exceeded to obtain a homogeneous spraying of the liquid product over a surface of a field.