A present investigation was carried out on chilli crop under field condition at the farm of Agriculture Research Station, Dr. P.D.K.V., Achalpur Dist. Amravati, Maharashtra during Kharif, 2024-25 with a view to study bio-efficacy of bio stimulant YK STAR with different doses and its role in growth, yield and quality of chili variety PDKV Hirkani. The experiment was laid in the randomized block design with 05 treatments and 04 replications with different quantities of bio stimulant YK STAR. Bio stimulant YK STAR used comprised of oil based eugenol, rhodophytes extract, organic matter, alginic acid and other ingredients at different treatment comprises of 1.5 ml, 2.0 ml, 3.0 ml in one liter of water, control and only fertilizer. From the above experiment, it may be concluded that, the treatment T₄ (YK STAR - 3.0 ml per liter of water) was recorded significantly highest fruit length, fruit width, no of fruits plant^-1, yield plant^-1 and yield ha^-1 followed by T₃ (YK STAR - 2.0 ml per liter of water) treatment which wear at par. Hence T₃ - YK STAR - 2.0 ml per liter of water treatment found best.