<p>The Rice-duck integrated system (RDIS) is more lucrative in many Asian countries but is uncommon in India. Hence, a two-year investigation was formulated to study the impact of the RDIS on rice and duck production under organic farming conditions. Three varied numbers (200, 300, and 400&#xa0;ha⁻¹) of ducks were allowed into the rice fields from three times (10, 20, and 30&#xa0;days after transplanting—DAT) up to the flower initiation of rice. These nine treatment combinations were compared with the control (rice alone). The findings showed that releasing 400 ducks ha⁻¹ at any time (10, 20, or 30 DAT) into the rice fields significantly increased the number of tillers, productive tillers, panicle weight, grain yield (8.62 and 28.01% across years), and straw yield of rice, duck yield, rice equivalent yield, and gross returns compared to other treatments. However, a decreased rice plant population was noticed due to the release of ducks (of any number) from 10 DAT. The release of 400 ducks ha⁻¹ from 10 DAT earned a higher net return and benefit–cost ratio, besides an additional duck production of 324.2 to 373.2&#xa0;kg&#xa0;ha⁻¹. Hence, the study concluded that rice-duck integration had a positive influence on rice growth and yield, and benefits the economic parameters. Specifically, releasing 400 ducks ha⁻¹ from 10 DAT proved to be a cost-effective and sustainable approach for organic rice production in India.</p>