The present invention provides a crop harvester (100) mounted on rear of a power tiller used for harvesting crops grown on ridges in a row such as rhizomes and tubers deriving power from the PTO of the power tiller through a belt and pulley arrangement comprising at least one blade with a plurality of bar points (15), a plurality of metallic slats (16) hinged at the rear ends of the at least one blade (15) and at least one depth control wheel (24).