nitrogen fixer

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noun

any of various microorganisms in the soil involved in the process of nitrogen fixation.

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Origin of nitrogen fixer

First recorded in 1910–15

Like Biden, Klain is a consummate fixer, with Georgetown and Harvard Law School degrees thrown in for good measure.
Where There’s Trouble, You’ll Usually Find Joe Biden|Lloyd Green|October 21, 2014|DAILY BEAST
His fixer, who Barfi said was affiliated with the Islamist Tawhid brigade, was set free 15 days later.
Obama Administration and Sotloff Family Battle Over Blame for Journalist’s Kidnapping|Josh Rogin|September 22, 2014|DAILY BEAST
She asked if I had heard anything about the fixer, X. I had not.
Was U.S. Journalist Steven Sotloff a Marked Man?|Ben Taub|September 2, 2014|DAILY BEAST
A fine fixer, I had heard from correspondents who knew him, but there had been a problem recently.
Was U.S. Journalist Steven Sotloff a Marked Man?|Ben Taub|September 2, 2014|DAILY BEAST

He said that he had secured the fixer, ‘X,’ through a fellow Western journalist, and not by writing to 30 Syrians via Facebook.
Was U.S. Journalist Steven Sotloff a Marked Man?|Ben Taub|September 2, 2014|DAILY BEAST
Ammonia is a compound of nitrogen and hydrogen, but it cannot be formed by the direct union of these gases.
Elements of Agricultural Chemistry|Thomas Anderson
The form in which nitrogen may be absorbed has given rise to much difference of opinion.
Elements of Agricultural Chemistry|Thomas Anderson
Pigeons' dung, according to Boussingault, contains 8·3 per cent of nitrogen, equivalent to 10·0 of ammonia.
Elements of Agricultural Chemistry|Thomas Anderson
Refuse horse hair generally contains 11 or 12 per cent of nitrogen.
Elements of Agricultural Chemistry|Thomas Anderson
Dry peat of good quality contains about one per cent of nitrogen, and a quantity of ash varying from five to twenty per cent.
Elements of Agricultural Chemistry|Thomas Anderson