The most important soil micro-organism causing decay and nutrient recycling are

Bacteria and fungi are the most important soil micro-organisms that cause decay and nutrient recycling. Bacteria are the most numerous micro-organisms in the soil and are responsible for the decomposition of organic matter into simple compounds. Fungi, on the other hand, are important in the breakdown of complex organic matter such as lignin and cellulose. Together, these micro-organisms are responsible for breaking down dead plant and animal matter, releasing nutrients back into the soil that can be used by other plants. This process is essential for maintaining healthy soil and sustaining plant growth.