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Nitrochalk
Nitrochalk n. 
/ˈnaɪtrəˌtʃɑk/ (a proprietary name for) a fertilizer consisting of a mixture of ammonium nitrate and calcium carbonate (chalk).
Brit. /ˈnʌɪtrə(ʊ)tʃɔːk/
, /ˈnʌɪtrə(ʊ)tʃɔːk/U.S. /ˈnaɪtrəˌtʃɔk/
, /ˈnaɪtrəˌtʃɔk//ˈnaɪtrəˌtʃɑk/ΘΚΠ
the world > food and drink > farming > cultivation or tillage > preparation of land or soil > fertilizing or manuring > [noun] > chemical fertilizer > specific
manure1744
plaster of Paris1787
superphosphate1843
nitrate1846
super1891
Nitragin1896
complete fertilizer1904
nitrolime1908
Nitrochalk1927
Sequestrene1949
Krilium1952
1927 Daily Express 7 Dec. 12/4 To replace Chilean nitrate we shall make..nitrochalk, a rich mixture of nitrogen and calcium.
1954 Jrnl. Brit. Grassland Soc. 9 323 (heading) The influence of ‘Nitro-Chalk’ on established lucerne leys.
1988 J. Elkington & J. Hailes Green Consumer Guide (1989) 82 The Soil Association..prohibits all other mineral fertilizers, including nitrochalk.
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