Related Clues:

• Dirties
• Muddies, as the water
• Taints
• Begrimes
• Loam and marl, e.g.
• Makes a mess of
• Garden mixes
• Makes dirty
• Smudges
• Pedologist's study
• Churns up
• Renders unclean
• Agronomist's concerns
• Planting bases
• Agronomists' samples