What is soil organic matter and its benefits?

What is soil organic matter and its benefits?

• A. Decomposed plant and animal residues that improve soil structure, water-holding capacity, nutrient supply, and microbial activity.
• B. Inert mineral content that reduces soil fertility.
• C. A measure of soil pH.
• D. A type of fertilizer.

Answer: (A)

Soil organic matter is made up of decomposed plant and animal residues, plus living and dead microbial biomass, that accumulates in the soil. This material helps particles bind together into stable aggregates, which improves soil structure, making soil more crumbly, better at porosity, and easier for roots to grow. It also boosts the soil’s water-holding capacity, so more water is available to plants during dry periods. As organic matter slowly decomposes, it releases nutrients over time, helping supply nitrogen, phosphorus, and other elements. A thriving microbial community fed by organic matter drives nutrient cycling and overall soil fertility. Options that describe inert minerals, a measure of pH, or a type of fertilizer don’t capture this dynamic and functional role of organic matter.

Soil organic matter is made up of decomposed plant and animal residues, plus living and dead microbial biomass, that accumulates in the soil. This material helps particles bind together into stable aggregates, which improves soil structure, making soil more crumbly, better at porosity, and easier for roots to grow. It also boosts the soil’s water-holding capacity, so more water is available to plants during dry periods. As organic matter slowly decomposes, it releases nutrients over time, helping supply nitrogen, phosphorus, and other elements. A thriving microbial community fed by organic matter drives nutrient cycling and overall soil fertility. Options that describe inert minerals, a measure of pH, or a type of fertilizer don’t capture this dynamic and functional role of organic matter.