An agricultural machine , comprising: a liquid reservoir that stores liquid to be applied to a field over which the agricultural machine is traveling; a supply line that defines a supply conduit; a plurality of valves disposed along the supply line , each valve having an inlet end and an outlet end and being controlled to move between an open position and a closed position by a pulsed control signal; a pump system that pumps the liquid from the liquid reservoir along the supply line to the inlet ends of the valves ; a plurality of nozzles , at least one nozzle corresponding to each valve so that when the corresponding valve is open, the liquid flows through the valve to the corresponding nozzle ; a plurality of row pressure sensors each sensing pressure at the outlet end of one of the plurality of valves and generating a corresponding row pressure signal indicative of the sensed pressure; pulse characteristic sensing logic that receives the row pressure signal from each row pressure sensor and identifies a pulse characteristic indicative of a liquid pulse provided by the corresponding valve in the open position and generates a valve pulse characteristic signal indicative of the pulse characteristic; and a pulsed valve control signal generator that generates the pulsed control signal based on the valve pulse characteristic signal, characterized in that the agricultural machine further comprises time delay logic configured to receive the pulsed control signal and the valve pulse characteristic signal and identify an open time delay between the pulsed control signal generating a valve open signal controlling the valve to open and the valve pulse characteristic signal indicating that the valve is in the open position. a liquid reservoir that stores liquid to be applied to a field over which the agricultural machine is traveling; a supply line that defines a supply conduit; a plurality of valves disposed along the supply line , each valve having an inlet end and an outlet end and being controlled to move between an open position and a closed position by a pulsed control signal; a pump system that pumps the liquid from the liquid reservoir along the supply line to the inlet ends of the valves ; a plurality of nozzles , at least one nozzle corresponding to each valve so that when the corresponding valve is open, the liquid flows through the valve to the corresponding nozzle ; a plurality of row pressure sensors each sensing pressure at the outlet end of one of the plurality of valves and generating a corresponding row pressure signal indicative of the sensed pressure; pulse characteristic sensing logic that receives the row pressure signal from each row pressure sensor and identifies a pulse characteristic indicative of a liquid pulse provided by the corresponding valve in the open position and generates a valve pulse characteristic signal indicative of the pulse characteristic; and a pulsed valve control signal generator that generates the pulsed control signal based on the valve pulse characteristic signal, characterized in that the agricultural machine further comprises time delay logic configured to receive the pulsed control signal and the valve pulse characteristic signal and identify an open time delay between the pulsed control signal generating a valve open signal controlling the valve to open and the valve pulse characteristic signal indicating that the valve is in the open position. <EOS>