Compare organic mulch and inorganic mulch in terms of nutrient contribution and long-term soil impact.

Compare organic mulch and inorganic mulch in terms of nutrient contribution and long-term soil impact.

• A. Organic mulch adds organic matter as it decomposes; inorganic mulch generally does not add nutrients but can improve moisture retention; organic mulch can provide temporary weed suppression.
• B. Inorganic mulch adds nutrients over time.
• C. Organic mulch is inert and does not affect moisture.
• D. Both add equal nutrients over time.

Answer: (D)

When evaluating mulch, the main idea is how it affects soil fertility and soil life over time. Organic mulch is a source of organic matter; as it decomposes, it becomes part of the soil, improving structure, water-holding capacity, and nutrient cycling, while feeding soil organisms. Inorganic mulch, on the other hand, does not supply nutrients or organic matter, so its long-term impact on fertility is minimal, though it can help conserve moisture, regulate soil temperature, and suppress weeds. It’s also true that organic mulch offers weed suppression while it’s present, though some suppression is temporary as it breaks down. This is why the best description is that organic mulch adds organic matter as it decomposes, inorganic mulch generally does not add nutrients but can improve moisture retention, and organic mulch provides temporary weed suppression. The other statements misstate the nutrient contributions, such as claiming inorganic mulch adds nutrients over time or that organic mulch is inert and does not affect moisture.

When evaluating mulch, the main idea is how it affects soil fertility and soil life over time. Organic mulch is a source of organic matter; as it decomposes, it becomes part of the soil, improving structure, water-holding capacity, and nutrient cycling, while feeding soil organisms. Inorganic mulch, on the other hand, does not supply nutrients or organic matter, so its long-term impact on fertility is minimal, though it can help conserve moisture, regulate soil temperature, and suppress weeds. It’s also true that organic mulch offers weed suppression while it’s present, though some suppression is temporary as it breaks down. This is why the best description is that organic mulch adds organic matter as it decomposes, inorganic mulch generally does not add nutrients but can improve moisture retention, and organic mulch provides temporary weed suppression. The other statements misstate the nutrient contributions, such as claiming inorganic mulch adds nutrients over time or that organic mulch is inert and does not affect moisture.