Fig. 3From: How effective are on-farm mitigation measures for delivering an improved water environment? A systematic mapNumber of tree and grass buffer strip studies for each form of nitrogen (N) measured. Studies with multiple buffer types were excluded. Grass-shrub buffers were excluded. Tree buffer strips included tree; tree-grass; tree, grass, shrub; grass tree buffers. Studies where tree buffers were compared to grass buffers were excluded.Back to article page