Abstract
Four different bullock drawn puddlers were tested under wet sandy clay loam soil conditions and the comparative performance was evaluated from mechanical, ergonomical and economical aspects. From the results it was found that the improved rotary puddler gave better performance than others tested. The puddling index, draft requirement, vibration level and energy expenditure rate were 67.9%, 42.3 kg, 0.910 RMS/acc. mls2 and 5.02 k cal/min respectively. The work load was graded as moderately heavy. The cost of operation for two passes was calculated to be Rs.224.00/ha.
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