Evaluation of rice (Oryza sativa) - based cropping sequences under rainfedmedium land situation of Bihar plateau

An experiment was conducted during 1992-95 to evaluate the production poten tial and economics of different rice (Oryza sativa L.) - based cropping seq uences on rainfed, medium land of eastern plateau. Three rice cultivars, vi z 'MW 10', 'Pusa Jaldi Dhan 5' and 'RR 167-982' were followed by 4 winter c rops, viz toria [Blurssica rapa (L.) Thell. emend. Metzger var napus L., sy n B. campestris L. spp oleifera (Metzger) Sinsk var toria], niger (Guizotia abyssinica Coss.), horsegram (Macrotyloma uniforum Lam.) and linseed (Linu m usitatissimum L.) in a split-plot design. 'RR 167-982' rice gave the maxi mum grain yield (1.44 tonnes/ha). Among the different sequences 'RR 167-982 ' rice-linseed recorded the maximum rice equivalent yield of 3.27 tonnes/ha followed by 'RR 167-982' rice-toria. 'MW 10' rice-linseed gave the highest land-use efficiency value (61.09%), whereas the highest production efficie ncy was recorded in 'RR 167-982' rice-toria (15.39 kg/ha/day). Thus 'RR 167 -982' rice-linseed sequence may be recommended for this area as it gave the maximum gross returns (Rs 9 606/ha) and net return (Rs 5 516/ha).