The primary function of soil microorganisms in decomposition is to break down organic matter, recycling nutrients back into the ecosystem. These microorganisms, including bacteria and fungi, play a crucial role in the nutrient cycling process, enhancing soil fertility and promoting plant growth. By facilitating decomposition, they also help control pathogens and support a diverse range of soil organisms. Their activity directly affects ecosystem health and resilience, making them essential for sustainable agricultural practices and natural ecosystems.