Which of the following is a non-acid mulch material?

Which of the following is a non-acid mulch material?

• A. Grass Clippings
• B. Decayed Pine Needles
• C. Bentgrass
• D. Rough Bluegrass

Answer: (A)

Mulch acidity depends on what the material releases as it breaks down. Pine needles carry natural acids and degrade to lower soil pH, so decayed pine needles are acidic mulch. Grass clippings come from common lawn grasses and don’t introduce acidic compounds; when shredded and used as mulch, they decompose and add organic matter and nutrients without acidifying the soil, making them non-acid mulch material. Bentgrass and rough bluegrass are turf grasses, not typical mulch materials, so they don’t illustrate mulch acidity the way plant residues do. Thus grass clippings are the non-acid mulch option.

Mulch acidity depends on what the material releases as it breaks down. Pine needles carry natural acids and degrade to lower soil pH, so decayed pine needles are acidic mulch. Grass clippings come from common lawn grasses and don’t introduce acidic compounds; when shredded and used as mulch, they decompose and add organic matter and nutrients without acidifying the soil, making them non-acid mulch material. Bentgrass and rough bluegrass are turf grasses, not typical mulch materials, so they don’t illustrate mulch acidity the way plant residues do. Thus grass clippings are the non-acid mulch option.