The area immediately around the root is known as the rhizosphere. The rhizosphere is higher in soil organism activity due to increased food supply leaked by the root for the organisms to use. Nematodes Smaller soil organisms will include a wide variety of species. Another worm-like organism is the nematode. Nematodes are microscopic worms that feed on organic matter and other soil animals or infect plant roots.
Parasitic nematodes are the most important from an agricultural standpoint.
Many plants are affected, such as tomatoes, carrots, potatoes, peas, alfalfa, turfgrass, and fruit trees. Under a 10x hand lens, nematodes appear as transparent, thread-like worms. They live mainly in the water film around soil particles. Fungi The most active decomposers of organic materials in a forested soil are the soil fungi. This is mainly because they are tolerant of acid soil conditions.