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Onion detopping operation is tedious, time consuming and labour intensive which increases cost of operation. About 12.5 man-hours are required in manual detopping operation of 1 MT onion bulbs. The onion detopping is calls for its mechanization to reduce the losses in field and for timeliness in operation, fetching good market price and better storability. Therefore, a power operated onion detopper was developed for reducing the drudgery and labour involved in onion detopping operation. It consists of main frame, conveying unit, cutting unit, safety guard and power transmission unit. Electric...

Power operated onion detopper-cum-grader was developed which consist of feeding mechanism, power operated onion detopper and grading mechanism.Onions after detopping are graded in five grades i.e. 85 mm. The field performance of power operated onion detopper-cum-grader indicated that the average detopping efficiency was 85.71% with 237.192 kg h-1 output capacity. The average feeding rate was found to be 276.856 kg h-1 and the average time required for detopping was 0.421 h q-1. The average power requirement at load was found to be 0.880 Kwh-1. The average onion neck length before and after...