A system for treating a ground surface, comprising: a frame for transporting over a ground surface; an aeration apparatus coupled to the frame, the aeration apparatus comprising a plurality of aeration tines (80, 130) that form aeration pockets in the ground surface when driven to penetrate the ground surface; characterized in that the system for treating a ground surface further comprises a flexible roller system coupled to the frame and including: a plurality of rollers arranged in side-by-side axial positions with each roller having a generally rigid cylindrical surface to contact the ground surface, a flexible axle member extending through the plurality of rollers such that the flexible axle member flexes in response to the plurality of rollers contacting an undulating portion of the ground surface, and a plurality of constant force springs extending between the frame and the axle member so as to provide downward forces that urge the flexible axle member toward the ground surface [claim 2], the constant force springs configured to create a bending moment on the flexible axle member to thereby bend the flexible axle member and temporarily change the relative orientation of the rollers to conform to an undulating ground surface. a frame for transporting over a ground surface; an aeration apparatus coupled to the frame, the aeration apparatus comprising a plurality of aeration tines (80, 130) that form aeration pockets in the ground surface when driven to penetrate the ground surface; characterized in that the system for treating a ground surface further comprises a flexible roller system coupled to the frame and including: a plurality of rollers arranged in side-by-side axial positions with each roller having a generally rigid cylindrical surface to contact the ground surface, a flexible axle member extending through the plurality of rollers such that the flexible axle member flexes in response to the plurality of rollers contacting an undulating portion of the ground surface, and a plurality of constant force springs extending between the frame and the axle member so as to provide downward forces that urge the flexible axle member toward the ground surface [claim 2], the constant force springs configured to create a bending moment on the flexible axle member to thereby bend the flexible axle member and temporarily change the relative orientation of the rollers to conform to an undulating ground surface. a plurality of rollers arranged in side-by-side axial positions with each roller having a generally rigid cylindrical surface to contact the ground surface, a flexible axle member extending through the plurality of rollers such that the flexible axle member flexes in response to the plurality of rollers contacting an undulating portion of the ground surface, and a plurality of constant force springs extending between the frame and the axle member so as to provide downward forces that urge the flexible axle member toward the ground surface [claim 2], the constant force springs configured to create a bending moment on the flexible axle member to thereby bend the flexible axle member and temporarily change the relative orientation of the rollers to conform to an undulating ground surface.