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The objectives of this investigation were to investigate the effects of plowing depths (D) (35, 45, 55, and 65 cm), forward speeds (S) (0.341, 0.551 and 0.761 m sec -1 ) and outfitted subsoiler foot with wings on equipment performance for two subsoiler shanks arrangement (oblique and parallel) in silty clay loam soil. A significant (p<0.01) decrease in draft and specific resistance were observed for oblique shank arrangement compared with parallel shank arrangement. Furthermore, the draft and disturbed area increased significantly (p<0.01) with increasing operating depth, whereas specific resistance decreased significantly (p<0.01) with depth for the oblique and parallel shanks arrangement respectively. The values of draft, disturbed area and specific resistance of the oblique and parallel shanks arrangement tested were affected significantly (p<0.01) by adding wings to subsoiler feet. Forward speeds had a significant (p<0.01) effect on studded parameters. The optimal performance were found with the forward speed of 0.341 m sec -1 .

DEVELOPMENT AND PERFORMANCE EVALUATION OF THE DOUBLE TINES SUBSOILER IN SILTY CLAY SOIL PART 1: DRAFT FORCE, DISTURBED AREA AND SPECIFIC RESISTANCE