A field experiment was conducted at the Research Farm of Bihar Agricultural University, Sabour, Bhagalpur (Bihar) in Rabi season of 2024-25 to assess the “performance of conservation tillage and foliar nutrition of potassium nitrate on growth, yield attributes and productivity wheat. The experiments was laid out in split-plot design and replicated thrice with three levels of tillage practices viz Conventional tillage (M1), Zero tillage (M2) and Raised bed tillage (M3) and four levels foliar nutrition of potassium nitrate viz, control (F1), 1% KNO3 foliar spray at boot leaf stage (F2), 1% KNO3 foliar spray at post anthesis stage (F3) and 1% KNO3 foliar spray both at boot leaf and post anthesis stage(F4). Zero tillage (M2) recorded significantly higher dry matter accumulation, tiller number m⁻², and leaf area index (LAI) compared to the raised bed tillage (M3), and was statistically at par with conventional tillage (M1). Raised bed tillage (M3) produced the highest grains ear⁻¹ (44.21), ear length (11.60 cm) and test weight (41.76 g). Ear head density m⁻² was highest under zero tillage (M2). Zero tillage (M2) produced the highest grain (4528.9 kg ha⁻¹) and straw yield (6678.7 kg ha⁻¹). Among foliar nutrition treatments, Foliar spray of 1% KNO₃ at both booting and post-anthesis stages (F4) significantly enhanced dry matter accumulation and LAI, although plant height, tillers m⁻² and yield attributes (ear heads m⁻², grains ear⁻¹, ear length, and test weight), could not reached to the level of significance. Foliar application of 1% KNO₃ at boot leaf stage and post anthesis stage (F4) recorded significantly increased grain (4501.6 kg ha⁻¹) and straw yield (6610 kg ha). Interaction effect was also found significant under zero tillage (M2) with 1% KNO3 foliar spray at boot leaf and post anthesis stage (F4) in case of grain yield (4658.23 kg ha -1) and straw yield (6752.63 kg ha -1). Among different treatments zero tillage (M2) with 1% KNO3 potassium nitrate spray at boot leaf and post anthesis stage (F4) fetched higher yield and sustaining soil health.