Microorganisms in soil—such as bacteria, fungi, and algae—are among the most important biological components of the soil ecosystem. They play a fundamental role in the cycling of nutrients essential for plant growth of life. These microscopic organisms decompose organic matter and convert it into simpler elements that plants can absorb and utilize. First, microbes play a crucial role in the decomposition of organic materials in the soil, such as plant and animal residues. Bacteria and fungi secrete enzymes that break down complex compounds like cellulose and proteins into simpler substances, leading to the release of nutrients such as nitrogen, phosphorus, and carbon into the soil. Second, microbes participate in the nitrogen cycle, one of the most important biological cycles in soil. Some types of bacteria have the ability to fix atmospheric nitrogen and convert it into forms that plants can use. Other bacteria carry out nitrification, converting ammonia into nitrates that plants can easily absorb. Conversely, some bacteria perform denitrification, returning nitrogen back to the atmosphere. Third, microbes play a role in releasing phosphorus and other mineral elements in the soil. Certain bacteria and fungi can dissolve insoluble compounds and convert them into forms available to plants. Additionally, mycorrhizal fungi enhance the ability of plants to absorb nutrients and water from the soil. Moreover, microorganisms contribute to improving soil structure and increasing its fertility by producing adhesive substances that help bind soil particles together. This improves soil aeration and its capacity to retain water and nutrients. In conclusion, microorganisms are essential for maintaining soil fertility and sustaining agricultural productivity, as they continuously recycle nutrients and make them available to plants. Therefore, preserving microbial diversity in soil is vital for supporting agricultural ecosystems and achieving food security. Al-Mustaqbal University is the First University in Iraq
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