Hourly fuel consumption was determined using two flow meters (Flowmate Oval, Models Oval M-III and LSF 41), with precision of 0.01 mL, installed in series. Fuel consumption was determined in all the plots in volume unit (mL) and by the difference between the volumes of fuel determined at the entrance and in the return of the injection pump. Operational fuel consumption was obtained by the ratio of hourly consumption and the operational field capacity.