The main source of free nitrogen is action by soil microorganisms and plant roots on air spaces in the soil.

Name: The main source of free nitrogen is action by soil microorganisms and plant roots on air spaces in the soil.
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Question

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Soil microorganisms and plant roots have the ability to convert atmospheric nitrogen into forms that are usable by plants, making it available as a source of free nitrogen in the soil.

The Main Source of Free Nitrogen Is Action by Soil