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Soil is a renewable resource. It is the underlying foundation of our houses, factories, and motorways as well as a filter for human, industrial and animal wastes. Still, to most people, soil is the natural medium in which plants grow. Soils harbour a diverse community of living organisms, both animals and plants. These range from burrowing rodents and large tree roots to earthworms and insects down to the tiniest bacteria.

The number and weight of these organisms can vary tremendously, depending on the conditions. A single gram of soil can contain up to several billion bacteria and more than a kilometre of fungal strands. In most cases, microorganisms make up 90-95% of the total weight of organisms in soils.

by : Reyna

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12y ago

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