13 
The same carriers of plant food were used as sources of nitrogen, 
phosphoric acid and lime as previously stated, but the potash was ob¬ 
tained from manure salt instead of sulphate of potash. The rate of 
application was on the arbitrary basis of a 7-2 ^-1% mixture. Three 
hundred pounds of this was the amount applied to the normal plat in 
1908 and 400 pounds in 1910. This would give 21 pounds of phos¬ 
phoric acid, 7% pounds of nitrogen and 4% pounds of potash per acre 
in 1908, and 28, 10 and 6 pounds, respectively, in 1910. 
It is evident that there were larger increases wherever phosphoric 
acid was used. In the lower part of the table the amount of increase 
was obtained by deducting the yield on plat, which received nitrogen 
and potash, from that on plat 5 which received a complete fertilizer. 
Thus, on account of the soil of plat 2 being of different character the 
application of phosphoric acid alone would very probably not have 
shown so great an increase as this table indicates. Likewise the yield 
for potash, 12.2 bushels per acre, is too great since it represents the 
difference between the yield on plat 1 and on plat 5. The same dis¬ 
crepancy arises in the increase of 5.8 bushels due to nitrogen. How¬ 
ever, these figures represent the relative importance of the three ele¬ 
ments when applied to this dark phase, Toxaway loam. 
Lime was applied alone and in combination with nitrogen, phosphoric 
acid and potash. In both cases it gave material increases in yields as 
shown by the results on plats 18 and 19. It is of interest to note 
in this connection that the yield on plat 18 which received lime alone 
dropped from 33.1 bushels in 1908 to 13.7 bushels in 1910. It is very 
probable that this temporary beneficial effect of lime alone in 1908 
was due to liberation of the plant food of the soil. 
In table 6 is found the mineralogical and chemical composition of 
this soil. 
This soil shows an abnormally high potash content and the micas 
supply practically all this potash in the sand particles. Biotite in 
TION OF TOXAWAY LOAM, BUNCOMBE TEST FARM. 
Other than Quartz in 
Less Abundant Minerals in 
Rena arks 
Silt 
Sand 
Silt 
Biotite, muscovite 
Hornblende, ortho - 
clase, microcline, 
rutile, zircon, 
plagioclase, magnet¬ 
ite, apatite as in¬ 
clusions in quartz 
, 
Hornblende, chlorite 
orthoclase, micro¬ 
cline, plagioclase 
Biotite is for the most part 
fresh. Biotite, epidote and 
muscovite comprise most of 
the minerals other than 
quartz. 
Biotite, muscovite 
Hornblende, ortho- 
clase, microcline, 
rutile, zircon, 
plagioclase 
Hornblende, chlorite, 
orthoclase, micro¬ 
cline, plagioclase, 
rutile 
High percentage of potash 
bearing minerals. Micas 
compose principal part. 
Some biotite altered. 
