A field study was carried out during the Rabi seasons of 2023-24 and 2024-25 at the Instructional Farm of Uttar Banga Krishi Viswavidyalaya, Coochbehar, West Bengal to evaluate the efficacy of varying rice residue quantity as mulch, and splitting of nitrogen (N) for better weed control and higher yields in zero till wheat. The experiment was laid out in a split plot design with three replications. Four main plot treatments consisted of preceding rice harvested at different heights from ground leaving varying quantities of rice residues after rice harvest i.e., R0 – rice harvested at ground level (no residue retention); R1 – rice harvested at 20 cm from ground level; R2 – rice harvested at 40 cm from ground level and R3 – rice harvested at 60 cm from ground level. Due to the harvest of rice at various heights, the retained rice residue quantity varied under each main plot and the residue quantity estimated based on rice biomass retained was 1.7, 3.0 and 4.0 t/ha under R1; R2 and R3, respectively. The applied nitrogen dose was uniform at 150 kg/ha; however, the amount of nitrogen applied in each of the three splits of nitrogen application varied and four different splits of nitrogen were allocated under each main plot as sub-plot treatments, viz. N1 – 33+33+33%, N2 - 20+40+40%, N3 - 40+40+20%, N4 - 40+20+40%, each at basal, crown root initiation (CRI) and at active tillering stage, respectively. The wheat variety DBW 187 was used in the experiment. The rice residue retention had a noticeable impact on early soil moisture conservation and weed growth suppression in zero tillage wheat. The higher residue levels (keeping the rice straw by harvesting at 60 cm from ground level) effectively reduced weed pressure as evident by lower weed density and biomass with increased weed control efficiency (WCE) (73-81%). Thus, preceding rice crop residues had a great impact in supressing weeds under zero till wheat. The nitrogen split application, with varying nitrogen dose at each split, didn’t have a significant impact on weed density and biomass. The nitrogen application in three equal splits at basal, CRI and active tillering stage resulted in significantly higher wheat grain yield.