Objective. The research aims to study the effect of maggot fertilizer and NPK fertilizer on the growth, productivity and seed quality of soybean plants. Methods. The research was conducted at the Exfarm of the Faculty of Agriculture, Hasanuddin University, Makassar from October 2023 - March 2024. The research was in the form of a 2-factor factorial experiment based on a Randomized Group Design (RGD). The first factor is the dose of maggot fertilizer which consists of 3 levels, namely 0 ton/ha maggot, 10 ton/ha maggot and 20 ton/ha maggot. The second factor is the dose of NPK fertilizer which consists of 3 levels, namely 0 kg/ha NPK fertilizer, 100 kg/ha NPK and 200 kg/ha NPK. Results. The results showed that there was a significant interaction between the treatment of 0 ton/ha maggot fertilizer and 100 kg/ha NPK fertilizer at harvest age (106.22 dap) and dry weight of 100 seeds (18.10 g). The treatment of 20 tons/ha of maggot gave the best effect on 50% flowering age (40.44 dap), percentage of filled pods (77.45%), number of pods per plant (128.80 pieces), number of seeds per plant (138.72 seeds), dry weight of seeds per plant (15.59 g), and production per hectare (3.34 tons). 0kg/ha NPK fertilizer gave the best effect on flowering age (40.56 dap). Filled pods (0.785), number of seeds (0.993) and seed dry weight (1.000) were significantly positively correlated to per plot production. Conclusion. Based on the results of the study, it is concluded that the use of maggot fertilizer and NPK fertilizer has a significant effect on the productivity of soybean plants but has not significantly affected the improvement of seed quality. Growth and production variables are positively correlated and have a very significant positive direct effect on the productivity of soybean plants.