Eutrophication caused by excess runoff of nitrate and phosphate fertilizer from farmland could be avoided by substitution of natural,organic fertilizers,like manures,for synthetic fertilizers.

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Natural, organic fertilizers like manures also contain nitrates and phosphates, which can contribute to eutrophication if they run off into water bodies in excess, similar to synthetic fertilizers.

Eutrophication Caused by Excess Runoff of Nitrate and Phosphate Fertilizer