Phosphorus and potassium fertilizers were studied to see how they affect the growth and yield of soybeans in a maize-soybean intercropping system. Increasing potassium fertilizer led to more plant growth, while phosphorus fertilizer had a mixed effect. The best results were seen with a combination of P2O5 17 kg·hm-2 and K2O 112.5 kg·hm-2. More potassium increased the amount of dry matter going to the soybean pods, while more phosphorus had the opposite effect. Overall, adding more phosphorus and potassium improved the amount of nutrients going to the soybean pods, leading to higher yields. The best yield was achieved with the P2K3 treatment, which produced 2832.04 kg·hm-2, significantly more than other treatments.