1NRC for Soybean, Indore-452 017, (Madhya Pradesh).
2Central Potato Research Station, Model Town, Jalandhar-144 003, (Punjab).
3Central Potato Research Institute, Shimla-171 001, (Himachal Pradesh).
The rubber roller type of Potato Grader for small farmers and hill regions was developed. The main components of the grader were feed conveyor, frame, grading unit, collecting chutes and power transmission unit. The grader required electric motor of 0.746 KW to drive various component of grader at full load with reduction gear box of 13:1. The grader was tested with potato of three varieties viz. Kufri Chandramukhi, Kufri Sindhuri and Kufri Jyoti to see the average size and sphericity of potato. It was found that grading of potato was very uniform irrespective of variety of potato. The maximum separation efficiency at optimum of conveyor speed (7.5 m/min) was found to be 93% for the out put capacity of about 45 q/h.
