Productivity and efficiency of two groups of farms were compared. One group have been practicing cooperating joint farming in Boro paddy production. The other group comprised of fully individually operated farms. Both the groups produce Boro crop under deep tubewell irrigation. A Cobb-Douglas type production function analysis as well as residual method of analysing efficiency revealed that the farmers under cooperative management showed lower performance than the individually operated farms. The differences in production performance between the two groups happened owing to poor management of cooperative farms. Strong national commitment with government technical support and constant assistance of an effective extension service are important in attaining success of cooperatives.