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The physico-mechanical properties of four popular cultivable onion varieties i.e., Ballari red, Arka kalyan, Satara (local verity), Kalasa (local variety) in Koppal (Karnataka)were studied to form an important database for designing of storage structures, cleaning, grading, sorting and harvesting equipments. The equatorial diameter of all size category Ballari red onion variety ranged from 4.01 to 8.35 cm, polar diameter ranged from3.82 to 6.62 cm and thickness of Ballari red onion variety ranged from 1.25 to 2.51 cm where as the lowest values of equatorial diameter was observed in Kalasa (local variety) i.e., 3.2 to 7.12 cm, polar diameter ranged from 2.89 to 5.12 cm and thickness from 1.22 to 2.01 cm, respectively. Shape index of three out of four was oval in shape. The geometric mean diameter (Dgm) and arthematic mean diameter (Dam) of large, medium and small size verities as Ballari red, Arka kalyan, Satara, Kalasa had 2.65 to 5.09, 2.5 to 4.58, 2.35 to 4.43 and 2.23 to 4.13 cm, respectively. The highest mean value of bulk density from 678.9 to 390.42 kg/cm3 was observed in Ballari red onion followed by Arka kalyan of 662.7to 390.42 kg/cm3, Satara 628.4 to 390.23 kg/cm3, Kalasa 618.59 to 385.24 kg/cm3and highest mean value of angle of repose which was observed in Ballari red i.e, 37o (large size) and lowest was observed 20.90o in Kalasa (small size) variety. Article History Received: 19 July 2017 Accepted: 23 November 2017

A Study on Physico-Mechanical Properties of Onion Varieties Under Koppal District, (Karnataka).