The field experiment was conducted at El-Hashan,Tripoli, Libya.  to investigate the response the tillage depth by uesing rotary plow on soil physical properties, implements performance, barley production under planting libyan conditions. Four tillage depth 8, 13,18 and 23 cm. were used to determiend soil porosity percentage, energy requirements and barley production The results show that with the use of tillage depth 8, 13,18 and 23 cm Results show that, soil porosity percentage, values were 15.43, 17.88, 14.98 and 15.87%., energy requirements values were 16.10, 21.10, 24.5 and 27.24 kW.h/ha., while the barley yield  were 570, 630, 673 and 596 kg/h_.