Kalsium nitrat: Perbedaan antara revisi
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Norgessalpeter disintesis di [[Notodden]], [[Norwegia]] pada tahun 1905 melalui [[proses Birkeland–Eyde]].<ref>{{cite journal| title= THE MANUFACTURE OF NITRATES FROM THE ATMOSPHERE BY THE ELECTRIC ARC—BIRKELAND-EYDE PROCESS| first=Sam | last=Eyde | journal= Journal of the Royal Society of Arts| volume= 57| issue = 2949 | year= 1909| pages= 568–576 | jstor=41338647}}</ref> Sebagian besar kalsium nitrat dunia saat ini dibuat di [[Porsgrunn]].<ref>{{cite book
| title = The world's greatest fix: a history of nitrogen and agriculture
| url = https://archive.org/details/worldsgreatestfi0000leig
| author = G. J. Leigh
| publisher = Oxford University Press US
| year = 2004
| isbn = 0-19-516582-9
| pages = [https://archive.org/details/worldsgreatestfi0000leig/page/134 134]–139
}}</ref><ref name="Birkeland1906">{{cite journal|last1= Birkeland|first1 =Kr.|title=On the oxidation of atmospheric nitrogen in electric arcs|journal=Transactions of the Faraday Society|volume=2| issue=December|year=1906|pages=98|issn=0014-7672|doi=10.1039/tf9060200098}}</ref>
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