Soybean is a food crop highly demanded by the Indonesian people, but its productivity has not been able to meet the needs. Increasing its productivity could utilize organic fertilizers containing complete nutrients and capable of improving soil properties, as well as phosphate fertilizers which play a role in the flower formation phase and plant yields. This study aimed to obtain the optimum dose of a combination of organic manure and phosphate fertilizers on soybean growth and yield. This research was conducted at the Jumantono experimental farm of the Faculty of Agriculture, Sebelas Maret University (UNS), located in Sukosari Village, Jumantono District, Karanganyar Regency, from Desember 2024-Maret 2025. The method used was a two-factor factorial Randomized Complete Block Design (RCBD) with three blocks. The first factor was the of cow manure (0; 62.5; 125 and 187.5 g.plant-1). The second factor was dose of phosphate fertilizer (0; 1.31; 2.61 and 3.92 g.plant-1). The parameters observed in this study were divided into two categories: growth (plant height, number of nodes, number of leaves, leaf area, flowering age, fresh shoot weight and dry shoot weight) and yield (number of filled pods, fresh pod weight, dry pod weight and 100 seed weight). The observation data were analyzed using a analysis of variance followed by a regression test. The results showed that the provision of cow manure at a dose of 187.5 g.plant-1 combined with phosphate fertilizer at 3.92 g.plant-1 produced the highest dry weight of pods. Cow manure at an optimum dose of 128.33 g.plant-1 increased growth, indicated by the highest dry weight of the stover. Cow manure at an optimum dose of 107 g.plant-1 increased development, indicated by the fastest flowering age. Phosphate fertilizer at a dose of 3.92 g.plant-1 still increased the number of filled pods per plant.