Field data collected from two samples of 101 pure owner-operators and 100 part-tenant farmers were analysed and interpreted for assessing effect of farm size and tenurial status of land on production efficiency. Medium farms (0.75--2.00 hectares) appeared to achieve the highest efficiency followed by small farms (below 0.75 hectare) and large farms (above 2.00 hectares) revealing that the relationship between farm size and efficiency is neither positive nor negative throughout. If one moves from small farms to medium farms, the relationship is positive ; and if o ie moves from medium farms to large farms, it is negative. Production efficiency tended to be the highest on owned land followed by cash rented land crop share rented land with input coat-shaving and crop-share rented land without input cost-sharing suggesting that, irrespective of rental arrangements, the mechanism of land tenancy acts acts as a hindrance to higher production efficiency. Inter-rental system comparison reveals that cash renting system is a better mechanism than crop-share renting even with input-cost sharing. However, input cost-sharing practice accelerated production performance on crop-share rented land.