Soil microorganisms, 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 essential nutrients required for plant growth and the continuation of life. These microscopic organisms decompose organic matter and convert it into simpler elements that plants can absorb and utilize. First, microorganisms play a vital role in the decomposition of organic materials in the soil, such as plant and animal residues. Bacteria and fungi secrete enzymes that help 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, microorganisms are involved in the nitrogen cycle, which is one of the most important biological cycles in the soil. Some types of bacteria have the ability to fix atmospheric nitrogen and convert it into compounds that plants can use. Other bacteria perform nitrification, converting ammonia into nitrates that plants can easily absorb. Conversely, some bacteria carry out denitrification, returning nitrogen back to the atmosphere. Third, microorganisms play a role in releasing phosphorus and 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 plant's ability 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 ability to retain water and nutrients. In conclusion, microorganisms are essential for maintaining soil fertility and sustaining agricultural productivity. They continuously recycle nutrients and make them available to plants. Therefore, preserving microbial diversity in soil is crucial for supporting agricultural ecosystems and achieving food security. Al-Mustaqbal University is the First University in Iraq
  الهدف الرابع : التعليم الجيد