The main fertilizers used in agriculture, including nitrogen and phosphorus. Phosphorus in the form of phosphate can be attached to the soil. The minority that runs on water. Therefore, substances that cause problems are nitrogen. Fertilizer use most often put together far more than the plant will be used up. When it rains the water will leach out nitrogen flow to the surface. Into the river Help algae grow a lot. Water color, smell, and when these algae die down. It makes the water putrid and phenolic higher. White fog floating on the surface.