Abstract: This invention relates to a blade plough suitable for use on undulating ground. The blade plough has a floating blade which is able to pivot irrespective of the drawbar attachment to the tractor. A spring mechanism is provided to bias the blade in an operative attitude and thereby compensate for varying soil conditions. The blade also comprises an improved cutting edge having a hard laminate on its underside. Blade extension members are provided for varying the operating width of the blade.