Biochar and Abscisic acid (ABA) are considered beneficial bio- stimulants for crop production. However, limited information is available on the effects of continuous applications of biochar as compared with ABA on rice. In this study, a field experiment was conducted in the two growing seasons 2020 and 2021. Grain yield and yield attributes of grown rice cultivar Sakha Super 300 were compared, with and without applications of biochar, ABA, and their interaction under water stress in both seasons. Two experiments were laid out in strip plot design based on randomized complete block design (RCBD) in four replications. Main plots were assigned to four different irrigation intervals as following: irrigation every four days (I₁), every six days (I₂),every eight days (I₃), and every ten days (I₄). While the sub-plots were allocated to the application of bio- stimulants as following (Untreated=control (B₁), Biochar (B₂), abscisic acid (ABA) (B₃), Biochar + abscisic acid (ABA) (B₄). The results showed that the application of bio- stimulants reduced the effect of water stress on yield and yield components of rice cultivar Sakha super 300, when plants irrigated every 4 days (I1 and every 6 days (I₂) with soil application of biochar and foliar application of ABA under studied conditions. Our study suggests that the positive effects of biochar and ABA application on rice yield and yield attributes depend on biochar and ABA application.