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This is best defined as a way that nitrogen is lost or emitted by the use of heat or radiation, mainly, from the sun. This can occur in the air or on the ground around vegetative regions. It is less likely to occur in arid regions, but it is possible.

[Soil Science Service of America; v.57; pages 1013-1020; 1993.] [Nature; v.349; pages 319-321; 1993.]

Source: Atmospheric Chemistry Glossary