A field experiment was conducted with a view to evaluating the effect of bioslurry and chemical fertilizers on the growth, yield, quality and nutrient uptake of onion at Central Research Farm, BARI, Gazipur during rabi seasons of 2018-19 to 2019-20. The tested crop was BARI Piaj-1. There were eleven treatments viz. T1: Native fertility, T2: 75% Soil Test Based (STB) chemical fertilizers, T3: 75% STB + 3 t ha-1 Poultry Manure (PM), T4: 75% STB + 3 t ha-1 PM slurry, T5: 75% STB + 5 t ha-1 Cowdung (CD), T6: 75% STB + 5 t ha-1 CD slurry, T7: 100% STB, T8: 100% STB + 3 t ha-1 PM, T9: 100% STB + 3 t ha-1 PM slurry, T10: 100% STB + 5 t ha-1 CD, T11: 100% STB + 5 t ha-1 CD slurry. The experiment was laid out in RCB design with three replications. The highest yield of onion (12.82 t ha-1 in 2018-2019 and 14.19 t ha-1 in 2019-2020) was obtained from T9 treatment (100% STB chemical fertilizers + 3 t PM slurry ha-1). The lowest yield of onion (5.51 t ha-1 in 2018-2019 and 6.16 t ha-1 in 2019-2020) was noted in native fertility treatment (T1). Total Soluble Solid (%TSS) content of onion bulb (17.15% in 2018-2019 and 17.56% in 2019-2020) was recorded higher also in T9 treatment. The uptake of nutrients by onion was also highest in the treatment T9 followed by T11. The highest gross return (2,70,200 Tk ha-1yr-1), gross margin (1,39,583 Tk ha-1yr-1) and marginal value product (1,53,400 Tk ha-1yr-1) were obtained from T9 treatment. Integrated using of bioslurry and chemical fertilizer showed better results in all yield parameters, yield, quality and nutrient uptake by onion. These also help to improve soil fertility of onion growing field.
Key words: Onion, bioslurry, quality, nutrient uptake, growth, yield, economics