Abstract: Two field trials were conducted to study the onion response to various doses of N, P and K fertilizers. Plant height, bulb diameter, single bulb weight and total marketable bulb yield increased significantly by the NPk fertilizer treatments. Plots treated with 90:60:80 kg NPK/ha, displayed significantly maximum marketable bulb yield over other treatments. Onion planted on ridges gave significantly better yield over flat planting. It was suggested that for obtaining maximum marketable bulb yield of onion variety, phulkara, the crop may be planted on ridges and fertilized with N, P and K fertilizers.