A field experiment was conducted in spring 2016 and 2017 at G.B.P.U.A&T, Pantnagar to evaluate the effect of different weed management practices on the morphological and physiological parameters of sweet corn (Zea mays L. var. ‘Sugar 75’), which determines the yield directly or indirectly. The experiment was comprised of twelve treatments. Effect of weed management practices were studied over several growth characters viz. plant height, crop dry matter accumulation, leaf area index, Fv/Fm value, crop growth rate, leaf chlorophyll content, yield, harvest index and nutrient uptake by crop. At 45 DAS, maximum crop height (57.5 cm), crop dry matter (776.5 g/m2), CGR (26.1 g/m2/day), LAI (6.71) and SPAD (60.4) records were obtained from twice hand weeding at 20 and 40 DAS. Fv/Fm value remained unaffected by weed interferences. A significant positive correlation of weed control efficiency was found with all the growth parameters However, weed dry matter accumulation and weed density impacted morpho-physiological characters and ultimate yield in a negative way.