Soil fragmentation and aggregate stability as affected by conventional tillage implements and relations with fractal dimensions

•The study evaluated soil structure as affected by conventional tillage implements.•Disk plough followed by two passes of cultivator was found to be the optimal technique for use in a clay loam soil.•Mass fractal dimension and mean weight diameter are strongly inversely correlated.•Higher values of mass fractal dimension and lower values of mean weight diameter may be used to quantify fine seedbeds.•Lower values of mass fractal dimension and higher values of mean weight diameter may be used to quantify coarse seedbeds.