A field experiment was carried out at the Institute of Agriculture and Animal Science (IAAS), Rupandehi, Nepal to investigate the effect of different organic manures, fertilizers, and their combination on the growth and yield of the White Viana variety of knol-khol (Brassica oleracea var. gongylodes L.). Randomized complete block design (RCBD) was used in experimenting, with three replications. The eight different treatments were T1 (FYM 20 ton ha-1), T2 (FYM 15 ton ha-1), T3 (PM 20 ton ha-1), T4 (Half of Recommended dose of fertilizers 60:40:45 kg NPK ha-1), T5 (FYM 15 ton ha-1 + Half of Recommended dose of fertilizers 60:40:45 kg NPK ha-1), T6 (FYM 10 ton ha-1 + Half of Recommended dose of fertilizers 60:40:45 kg NPK ha-1), T7 (PM 15 ton ha-1 + Half of Recommended dose of fertilizers 60:40:45 kg NPK ha-1), T8 (control). The maximum plant height (27.21 cm), leaf length (23.74 cm), leaf width (10.53 cm), crown spread (50.88 cm), knob diameter (20.02 cm), biological yield (538.56 g), and biological yield per hectare (21.54 t ha-1)

observed in T7. The maximum number of leaves (17.4), and harvest index (83.93 %) were recorded in T3 while the highest marketable yield (428 g) and marketable yield per hectare (17.12 t ha-1) was observed in T5. In summary, the application of poultry manure @ 15 ton ha-1 + Half of the Recommended dose of fertilizers 60:40:45kg NPK ha-1 was observed superior over other treatments in Paklihawa, Rupandehi condition of Nepal.