| |
| 1916 | 1917
Source | Tons K_{2}O | Per cent. | Tons K_{2}O | Per cent.
| | of total | | of total
| | production | | production
____________________|_____________|____________|_____________|____________
| | | |
Mineral sources: | | | |
Natural brines | 3,994 | 41.1 | 20,652 | 63.4
Altmite | 1,850 | 19.0 | 2,402 | 7.3
Dust from cement | | | |
mills | | | 1,621 | 5.0
Dust from blast | | | |
furnaces | | | 185 | 0.6
Organic Sources: | | | |
Kelp | 1,556 | 16.0 | 3,752 | 10.9
Molasses residue | | | |
from distillers | 1,845 | 19.0 | 2,846 | 8.8
Wood ashes | 412 | 4.2 | 621 | 1.9
Waste liquors | | | |
from beet-sugar | | | |
refineries | | | 369 | 1.1
Miscellaneous | | | |
industrial | | | |
wastes | 63 | .7 | 305 | 1.0
| ___________ | __________ | ___________ | __________
| | | |
Total | 9,720 | 100.0 | 32,573 | 100.0

--From U S. Bureau of Mines Report, 1918.