Kata Kunci Pencarian:
- Proses Birkeland–Eyde
- Kalsium nitrat
- Proses Haber
- Birkeland–Eyde process
- Kristian Birkeland
- Sam Eyde
- History of fertilizer
- Rjukan–Notodden Industrial Heritage Site
- Ammonia production
- History of the Haber process
- Nitrogen fixation
- Haber process
- Ostwald process
