Vienna Arbeiter Zeitung, April 22, 1916, p. 6.
...According to data of the potassium syndicate, consumption of potassium for fertilisers in Austria-Hungary and Germany during recent years was as follows (in kg. per sq. km. of usable surface):
| 1900 | 1910 | 1913 | |
| Austria | 12.4 | 64.3 | 114.2 |
| Hungary | 0.5 | 6.1 | 19.8 |
| Germany | 334.4 | 1,025.1 | 1,529.3 |
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