The process whereby nitrogen is removed from the soil and returned to the atmosphere is referred to as:

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Denitrification is the process by which microorganisms convert nitrates back into nitrogen gas, which is returned to the atmosphere through the process of outgassing. This is the opposite process of nitrogen fixation, where nitrogen gas is converted into a usable form for plants and organisms to use. Denudation refers to the process of erosion and weathering that removes rock and soil from the Earth's surface. Combustion is a chemical process where a substance reacts with oxygen to produce heat and light energy.

The Process Whereby Nitrogen Is Removed from the Soil and Returned