What minerals are found in the run-off from agricultural land and treated and untreated sewage effluents, which are highly responsible for eutrophication of water bodies?

Eutrophication is the excessive enrichment of water bodies with nutrients, leading to algal blooms and oxygen depletion. The primary nutrients responsible are nitrogen and phosphorus, which enter waterways through agricultural runoff (fertilizers) and sewage effluents. While carbon is not typically a limiting factor for eutrophication, potassium, arsenic, iron, and manganese are not the key drivers of this process.