%A Muhammad Shahid Ibni Zamir %T AGRO-ECONOMIC STUDIES ON DEFFERENT RICE-BASED CROPPING SYSTEMS AT CONVENTIONAL & ZERO TILLAGE %X No Abstract %D 2006 %K rice-based cropping systems, cropping systems, tillage, wheat, rice, berseem, mungbean, gram, sunflower, lentil %I University of Agriculture, Faisalabad %L HEC984