Abstract: Effects of tillage systems on sunflower yield have been studied. Tillage systems were investigated as follows: conventional tillage system such as mouldboard plough and disc harrow and conservational tillage such as chisel with disc harrow and rotary tiller. Penetration resistance, bulk density, sunflower yield and energy requirement of tillage systems were measured. Soil bulk density and penetration resistance were affected significantly by the tillage systems. Soil bulk density and penetration resistance mean values in conventional tillage system were lower than the other systems. Sunflower yield and energy consumption were found lower in conservational tillage system than that of the conventional system.