E. The ostwald process does not contribute to nitrogen fixation.
Nitrogen fixation is defined as the conversion of inert nitrogen gas into nitrogen compounds. The process can be natural or industrial and common example of products formed are nitrites, ammonia or nitrates. Methods of nitrogen fixation can be categorized into three types namely Haber process, atmospheric process and biological process.
Lightning strikes and combustion process in car engines is atmospheric process of nitrogen fixation. Rhizobium, Azotobacter are few examples of common microbes holding ability to perform nitrogen fixation. Thus, they are part of biological processes. Haber process is industrial. Ostwald process is the industrial process for synthesis of nitric acid.
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