From the recent international summit i.e. COP-26 and save soil campaign states the need of soil microbial fauna in the ecosystem for upcoming years that bridge the soil-plant relations in the age of extremes. Further activity of microbes is based on enzymatic reactions that takes place above and below the subsoil strata that need to be evaluated in legume-maize based system to turn down the climate change in the world. Thus, keeping in mind the view of treatments with of 6 main-plots: C1N1: groundnut100% RDN-maize, C1N2: groundnut75% RDN-maize, C2N1: soybean100% RDN-maize, C2N2: soybean75% RDN-maize, C3N1: greengram100% RDN-maize, C3N2: greengram75% RDN-maize and 3 sub-plots: F1:100% RDN, F2:125% RDN, F3:150% RDN at Maize Research Centre-ARI, India for 2 years. The conclusive note revealed that residues of greengram integrated with nitrogen doses added up the higher activity of bacterial count, urease, dehydrogenase, acid and alkaline phosphatases in rabi maize soils over soybean and groundnut residual retention. Besides the microbial activity when seen with 150% RDN applied multiplied the decomposition rate and availability of nutritional status compared to lesser doses. This activity was synchronous along the crop stages where highest at 60 DAS. However, interaction effect (Legume residues x Nitrogen gradient levels) was found to be non-significant in both years. This further resemblance that soil macro and microfauna have the inbuilt capabilities to recycle, reproduce the natural balance in the ecosystem within the sustainable ranges of respective localities.