There are nutrient management, land, manure, and habitats management measures that can be put in place to reduce the amount of nutrients entering rivers from diffuse sources.
Mae mesurau rheoli maethynnau, tir, tail a chynefinoedd y gellir eu rhoi ar waith i leihau faint o maetholion sy'n mynd i mewn i afonydd o ffynonellau gwasgaredig.