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In the uppermost six inches of soil is where most organic material is found. That's also where many plant roots are located. It's precisely because of the nearness to the surface and the availability of air, moisture, and nutrients that many roots tend to be located in those upper six inches. So it's a zone of high competition between soil food web critters and plants.

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15y ago

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What is the layer of soil with the most organic material?

The organic level which is the uppermost level of the soil.


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What decaying organic material in soil is called?

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