The used treatments were three engine revolutions, 157 rad s -1 (1500 rpm), 189 rad s -1 (1800 rpm) and 220 rad s -1 (2100 rpm), and evaluated the working speeds achieved, effective field capacity, operational fuel consumption, working depth of the disc harrow, skating wheels of the tractor and drawbar force. To exert traction the disk harrow was used of tires tractor John Deere brand, model JD6600 with power 91.48 kW (121 hp) engine.
For accomplishment of the tillage was used a disk harrow, mark Tatu Marchesan model GAICR off-set, with a cutting width of 2.57 m and consists of 20 cut disks of 0,71 m (28 inches) spaced at 0.27 m. The experiment was conducted at the Experimental Farm Lageado, belonging to the Faculty of Agricultural Sciences - UNESP Botucatu - SP. Thus, this study aimed to evaluate the operating performance of a disc harrow in clay soil using different spins. In this context the harrows are widely used, mainly because of the good working capacity and high efficiency in tillage soil. Even with the current techniques of conservation tillage, mobilization is still a widely used practice, either in initial preparation as in reform of agricultural areas.
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