Nitrogen and phosphorus levels in agricultural wetlands affect the growth of plants like Typha latifolia and Juncus effusus. High ammonia levels can limit plant growth, but balancing nitrogen and phosphorus can increase biomass. Juncus is more tolerant to ammonia than Typha. Adjusting the N:P ratio can reduce ammonia toxicity, with the best growth seen at a 15:1 ratio. Each plant species uses nitrogen and phosphorus differently, with Juncus having an average ratio of 12:1 and Typha 9.1:1. Controlling N:P ratios more precisely could improve waste removal in wetlands.