3*4 
Journal of Agricultural Research 
Vol. XIV, No. 8 
rye. The dry matter of soybean has been increased about 33 per cent 
when lime was used in conjunction with biotite. There was also a 
noticeably increased growth from muscovite caused by calcium carbo¬ 
nate. A much smaller increase was found from this material when the 
potash was applied as orthoclase or microcline. 
(6) Time caused the soybeans to remove more potash from the soil 
with potassium-sulphate, biotite, and muscovite treatments. This 
should not be taken necessarily to indicate that potash has been driven 
into solution, but that more favorable conditions for plant growth have 
been set up in the soil. More vigorous plants are thus produced, plants 
capable of removing more of this nutrient material. The results from 
the cowpeas were similar to those of soybeans. 
(7) SHghtly more potash was removed, after two years' cropping, by 
Nfs nitric acid from the pots fertilized with biotite and muscovite than 
from the control pots. No mote potash was removed by this solvent 
where orthoclase and microcline had been added than from the controls. 
(8) Lime does not appear to increase the solubility of the soil potash 
in Nfs nitric acid from any of the treatments. 
LITERATURE CITED 
Briggs, L. J., and BrEazeale, J. F. 
1917. AVAILABILITY OP POTASH IN CERTAIN ORTHOCEASE-BEARING SOILS AS AF¬ 
FECTED by lime or gypsum. In Jour. Agr. Research, v. 8, no. 1, p. 21-28. 
Clark, F. W. 
1916. the data of geochemistry. U. S. Geol. Survey Bui. 616, 821 p. 
Curry, B. E-, and Smith, T. O. 
1914. GRANITIC SOIL POTASSIUM AND ITS RELATION TO THE PRODUCTION OF HAY. 
N. H. Agr. Exp. Sta. Bui. 170, 32 p., 7 fig. 
Fraps, G. S. 
1912. THE ACTIVE POTASH OF THE SOIL AND ITS RELATION TO POT EXPERIMENTS. 
Texas Agr. Exp. Sta. Bui. 145, 39 p., 3 
1916. THE EFFECT OF ADDITIONS ON THE AVAILABILITY OF SOIL POTASH, AND THE 
preparation OF sugar humus. Texas Agr. Exp. Sta. Bul. 190, 30 p. 
Hartwell, B. L-, and Pember, F. R, 
1908. EXPERIMENTS WITH FELDSPATHIC ROCK AS A SOURCE OF POTASSIUM. R. I. 
Agr. Exp. Sta. Bul. 129, p. 197-206, 2 fig. 
Hilgard, E. W. 
1906. soils ... 593 p., illus., diagr. New York, London. 
Johnstone, Alexander. 
1889. on the action of pure water, and of water saturated with carbonic 
acid gas, on the minerals OF The mica family. In Quart. Jour. Geol. 
Soc. [London], v. 45, p. 363-368. (Original not seen.) 
Kilgore, B. W., and others. 
1914. FERTILIZER EXPERIMENTS WITH COTTON ON THE SANDY LOAM SOILS (NOR¬ 
FOLK sandy loams) of the coastal plain. Bul. N. C. Dept. Agr., v. 35, 
no. 4 (no. 195), 48 p. 
