Explain how organic matter content of a soil is influenced by: i. bulk density ii. soil temperature

Here's how organic matter content influences bulk density and soil temperature:

• i) Bulk density:

  • Organic matter has a lower density than mineral soil particles.
  • An increase in organic matter content generally decreases the bulk density of the soil. This is because organic matter improves soil aggregation, creating more pore spaces and making the soil lighter and less compact.

• ii) Soil temperature:

  • Organic matter typically has a darker color than mineral soil, which causes it to absorb more solar radiation, potentially leading to higher soil temperatures.
  • However, organic matter also has a higher specific heat capacity and acts as an insulator, which helps to buffer temperature fluctuations, keeping the soil cooler during hot periods and warmer during cold periods compared to soils with low organic matter.