<![CDATA[Background: Common bean (Phaseolus vulgaris L.) is a nutritious vegetable with stable market demand. However, bean production in Riau Province has declined, presumably due to the dominance of Red Yellow Podzolic soils (PMK), which are characterized by low organic matter content and limited nutrient availability. Therefore, environmentally friendly fertilization innovations, such as the utilization of spent coffee grounds and liquid biofertilizers, are needed to improve soil fertility and enhance crop yield. Objective: This study aimed to determine and obtain the best interaction between spent coffee grounds and liquid biofertilizer on the growth and yield of common bean plants. Methods: The research was conducted over three months, from March to June 2025, at Jalan Raya Pasir Putih, Purwosari, Gg. HK, Pandau Jaya Village, Siak Hulu District, Kampar Regency. The experimental design used was a factorial Randomized Block Design (RBD) with two factors: doses of spent coffee grounds (0, 400, and 800 g per plant) and doses of liquid biofertilizer (0, 15, and 30 ml L⁻¹ per plot), with three replications. Observed parameters included leaf length, stem diameter, days to flowering, number of pods per plant, pod weight, and pod length. Results: The results showed that the A2P2 combination (800 g spent coffee grounds and 30 ml L⁻¹ liquid biofertilizer) produced the best leaf length, while the A1P1 combination (400 g spent coffee grounds and 15 ml L⁻¹ liquid biofertilizer) resulted in the highest number of pods, pod length, earlier flowering, and greatest pod weight. Nevertheless, the yield had not yet fully reached the maximum potential of the Maxipro variety. Conclusions: The combination of spent coffee grounds and liquid biofertilizer positively influenced the growth and yield of common bean, although more optimal dose management and organic matter decomposition are required.]]>
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