Embodiments of an equalization system include a spray system with a spray boom and a plurality of nozzles that have fluid flow measurement sensors to measure flow rate from each nozzle or each section of nozzles for different boom configurations. Based on a comparison of the flow indicators to the average value, target value or reference value, a deviation from a target nozzle outflow rate is determined The deviation is proportionally applied to adjust pulse width modulated nozzle control to equalize the performance of the nozzles or sections of nozzles.
