Abstract: Croplands in the mid-western United States subjected to surface mining pose a difficult problem for reclamation. The most perplexing problem associated with reclamation is excessive soil compaction due to the usage of heavy earthmoving equipment. Such compaction has been shown to affect the productivity of the crops grown later. This article describes design modifications to and a dynamic mechanical control system for a prototype mechanism mounted on the front of a conventional bulldozer that reconstructs soil with minimal compaction. The mechanical system consists of a powered helical auger, approximately 1 m in diameter, mounted on a conventional bulldozer. Soil placed by scrapers or trucks in windrows or shallow strips on graded overburden is displaced laterally to form an uncompacted rooting zone approximately 1.2 m deep. Soil can be deposited in one layer or the B- and A-horizons can be deposited separately. Modifications of the system and development of a dynamic control system to improve capacity and assure a level soil surface are described
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