Resource Conservation Technology (crop diversification, conservation tillage, residue management and mechanization) have shown to improve, conserve and use natural resources in more efficient way through integrated management of available soil and biological resources. The field experiments were conducted at Agricultural College and Research Institute, Tamil Nadu Agricultural University, Madurai during the period 2016-2018. The aim of study to evaluate the impact of varied tillage, weed and nutrient management practices on system productivity and resource (nutrient and energy) use efficiency in maize-based pulse cropping system. The experiments were laid out in a Split-split plot design with three replications. The results of this study revealed that, MT with 30% daincha residue combined with weed management practices of PE application of atrazine plus one hand weeding at 30 DAS and nutrient application of 75% RDF (NPK) + vermicompost + azhophos (T2W2N2) recorded highest NUE, EUE, yield and economic return. Similarly, CT and PE application of pendimethalin followed by one hand weeding at 20 DAS along with 100% RDF (NPK) (T1W2N1) recorded highest NUE, EUE and yield and economic return in blackgram. However in a whole system approach the experimental results revealed that CRT (minimum/zero tillage) with 30% crop residue retention and PE herbicides (Atrazine/Pendimethalin) application followed by one hand weeding (30 and 20 DAS) along with 75% RDF (NPK) + vermicompost + Bio-fertilizer (Azhophos/Rhizobium) recorded higher system productivity through enhancing nutrient and energy use efficiency in maize - blackgram cropping system.