An experiment was conducted at farmers field at Madandanga, Gayeshpur, Nadia, West Bengal during the winter seasons 201112 and 201213, to study the effect of water and nutrient-management practices on growth and yield of hybrid sunflower (Helianthus annuus L.). The experiment was laid out in split-plot design, assigning 3 irrigation levels in the main plot and 7 fertilizer treatments in the sub-plots. The experiment consisted of 21 treat- ment combinations replicated thrice. Results revealed that N P K B S (80, 40, 40, 1.5 and 25 kg/ha of N, 80 40 40 1.5 25 P O , K O, B and S respectively) treatment significantly and synergistically increased plant height at 100 days af- 2 5 2 ter sowing (DAS), leaf-area index at 75 DAS, total dry-matter accumulation at 100 DAS, crop-growth rate during 5075 DAS, basal girth at harvesting and capitulum diameter of hybrid sunflower (9.6, 65.1, 49.7, 49.0, 11.6 and 11.9% higher values than the crop in farmer fertilizer practice (FFP) plot respectively). The yield attributes, namely filled seeds/capitulum, filled seed weight/capitulum, total seed weight/capitulum and 100-seed weight, were signifi- cantly higher by 52.8, 63.5, 38.6 and 16.9% when grown with 3 irrigations, given at 30, 60 and 80 days after sow- ing (I ) than the plants receiving 1 irrigation (I ) and 75.7, 73.2, 97.8 and 30.0% with N P K B S treatment 30/60/80 30 80 40 40 1.5 25 than the FFP plots. Average seed and stalk yield of sunflower Aditya was the highest in I treatment, ac- 30/60/80 counting 44.1 and 78.8% more than the crop yield obtained under I treatment, respectively. Application of 30 N P K B S resulted in significantly higher seed and stalk yield (38.6 and 48.1% more than the values in FFP 80 40 40 1.5 25 plots). Irrigation with I resulted 1.2% more oil percentage compared to the I treatment. The oil content of 30/60/80 30 tested cultivar was significantly and synergistically increased by the application of N P K B S , accounting 80 40 40 1.5 25 6.4% more than that obtained with FFP. Irrigation fertilizer interaction had significant effect on oil content and the highest value was observed to be in seeds obtained in plots fertilized with N P K B S under 2 irrigations (I 80 40 40 1.5 25 30/ ). The maximum net return and benefit: cost ratio were recorded with the crop irrigated thrice (I ), accounting 60 30/60/80 118 and 35%, respectively, more over the crop irrigated once (I ). Irrespective of irrigation levels, combined appli- 30 cation of NPK and B (N P K B ) resulted in the highest net returns and benefit: cost ratio among all fertilization 80 40 40 1.5 practices, accounting 52 and 23%, respectively more over the crop fertilized with N P K (FFP). 60 30 30