The most important soil micro-organisms concerned with decay and nutrients-recycling are

The most important soil micro-organisms concerned with decay and nutrient recycling are bacteria and fungi. These micro-organisms play a vital role in breaking down organic matter such as dead plant and animal material into simpler forms, releasing important nutrients such as nitrogen, phosphorus, and sulfur back into the soil. Bacteria are particularly important in the early stages of decay, breaking down complex organic compounds into simpler forms that can be taken up by other organisms, while fungi play a crucial role in breaking down tougher materials like cellulose and lignin. Together, these micro-organisms help to maintain the fertility of the soil and support the growth of plants.