What vegetation is used in filter strips?

What vegetation is used in filter strips?

• A. Untreated grass
• B. Treated lawn grass
• C. Bare soil
• D. Plastic mulch

Answer: (A)

Filter strips rely on a belt of permanent vegetation to intercept and filter runoff before it reaches water bodies. The vegetation should be undisturbed and free of chemical treatments so it doesn’t contribute residues to the runoff. Untreated grass provides the necessary living filter: it maintains soil cover, slows water, and traps sediment. Treated lawn grass could release herbicides into runoff, bare soil offers little filtration and more erosion, and plastic mulch is not vegetation and won’t filter runoff.

Filter strips rely on a belt of permanent vegetation to intercept and filter runoff before it reaches water bodies. The vegetation should be undisturbed and free of chemical treatments so it doesn’t contribute residues to the runoff. Untreated grass provides the necessary living filter: it maintains soil cover, slows water, and traps sediment. Treated lawn grass could release herbicides into runoff, bare soil offers little filtration and more erosion, and plastic mulch is not vegetation and won’t filter runoff.