Effect of four primary tillage machines on some of qualitative properties of potato tubers

Due to importance of potato production and various factors affecting quality production, experiments were conducted at the research farm of Khurasegan Islamic Azad University, Isfahan. The experiments were carried out as completely randomized blocks design with four treatments using moldboard, disk, improves disk, and chisel plows. Results showed that the effect of tillage machine type on moisture percentage, dry material, density, different sugars (carbohydrates), pH and organic acids of tuber at 5% level of probability were not significant compared and all the measured parameters were at an acceptable range. The Duncan multidomain test at 5% level of probability showed that there is no significant difference between the effect of using improved disk plow and moldboard plow for most of measured characteristics. However, in some cases the effect of disk plow was superior. Therefore, the improved disk plow can be expressed a good substitute for the moldboard plow.