The terms "ammonium fixation" and "biological nitrogen fixation" refer to the same soil process.

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Ammonium fixation refers to the process where ammonium ions (NH4+) in the soil are immobilized and become unavailable for plant uptake. Biological nitrogen fixation, on the other hand, is the process by which certain bacteria convert atmospheric nitrogen (N2) into a form (such as ammonia or nitrate) that can be used by plants. These are different processes with different outcomes for plant nutrient availability.

The Terms "Ammonium Fixation" and "Biological Nitrogen Fixation" Refer to the Same