The wear rate of rotary plow blades was related to the tool speed in field tests. The experiments were performed at Paysandu Farming Center (Santa Elena, Medellin, in a sandy loam soil). Fixed tractor speed of 2 km/h and working depth of 120 mm were selected. Three rotational speeds were tested, namely 141, 177, 251 rpm which led to average mass losses of 0.67 g, 1.35 g and 2.33 g respectively. Optical and scanning electron microscopes aided to identify the wear mechanisms acting on the surfaces, being abrasion, and specifically micro-cutting, predominant. Also, the abrasive wear resistance of the tools was determined in laboratory according to ASTM G65 standard, procedure A.