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As part of an assignment for a class I edited this article. I restructured the article and added some new information. at some point I removed and added back some of the original content and unfortunately removed a citation needed link.. I am not sure how to add this back.. :( -- Cvtang ( talk) 01:58, 10 November 2020 (UTC)
small amount of nod factor usually is extracted,when oxygen is much in soil. by Cha. Korea University
This article was the subject of a Wiki Education Foundation-supported course assignment, between 10 August 2020 and 10 December 2020. Further details are available on the course page. Student editor(s): Cvtang.
Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT ( talk) 08:48, 18 January 2022 (UTC)