Nitrogen is one of the most important nutrient used by all organisms and is the key element in maintaining the sustainability and economic viability of farming systems across the world. In natural system, physical, chemical and biological processes drive the nitrogen cycle. However, the cycle is highly disrupted in conventional intensive agricultural system. Hence, nitrogen dynamics should be carefully studied to establish an effective and sustainable way to manage the agriculture system. No-tillage weed management (NTW) is one of the conservation agriculture (CA) methods in which weeds are controlled without using any kind of herbicides instead, they are manually managed beside the crops which can be a sustainable method to retain soil fertility as well as to maintain plant productivity. The effect of no tillage crop plantation with the presence of weed and role of fertilizer were studied by estimating N dynamics. Soil, weed, wheat, soil macrofauna and nitrogen leaching was analyzed for determination of nitrogen flux. No significant difference was observed between tillage and no tillage system in terms of yield, which suggests that there was less competition between the crops and the weeds in no tillage with weed management. Top layer of soil (0-5cm) in no tillage management had higher amount of nitrogen content compared to tillage management. Higher nitrogen use and the management practices like slashing and mulching the weeds, crops and weeds were able to sustain in the no tillage with weed plots.