At this moment in time, incessant cereal-cereal cropping with arbitrary use of fertilizers is pretense threat to rural sustainability and environmental security. Under such state of affairs crop diversification is the best options, which not only gives supplementary productivity but also ensure the rational use of the resources and resulted in substantial cutback of inputs.  Therefore a make inquiries was undertaken to study Performance, uptake and used efficiency of nutrients in maize and mashbean along with microbiological properties under intercropping system during kharif season of 2012 in which two cropping system viz., maize+mashbean and maize alone, two planting geometries viz., normal and paired planting and three fertility levels control, 100% NPK and 100% NPK + Zn + PSB, replicated thrice in a two and three factor RBD by using F test. The data on growth and yield were calculated on net plot area basis (15 m2), total uptake of nutrient and its used efficiency was recorded as per the standard procedure. The results revealed that growth; yield (40.46 kg ha-1) and its production efficiency (46.51 kg day-1 ha-1), crop growth rate (32.9 g m-2 day-2) total uptake of N (92.41 kg ha-1), P (20.72 kg ha-1) and K (105.28), Nutrient used efficiency (N, P, K and Zn) and microbial population viz., bacteria (69.02 x105) and fungi (15.79 x102) significantly superior in maize+mashbean intercropping systems, though actinomycetes (15.78 x104) remained not significant than their sole cropping. Likewise, paired planting geometry recorded maximum above parameters in maize than 50 cm spacing, whereas, in mashbean reverse trends were observed. Moreover, fertility level of 100% NPK+Zn+PSB resulted into higher values of above mentioned parameters in both crop than their respective counterparts, except control in case of nutrient used efficiency which was remained skip.