14 
the surface soil is for the most part in a fresh condition, as is usually 
the case more alteration has taken place in this mineral in the subsoil. 
In the surface soil there is considerably more phosphoric acid than is 
usually found, in our soils, the principal portion of this element of 
plant food is in organic form or as inclusions in quartz fragments. It 
is quite possible that the marked increase in yield on plat 18 where 
lime was used alone was due to the liberation of phosphoric acid from 
the organic matter. In the subsoil of this field there is only 438 pounds 
TABLE 7. RESULTS ON FIELD B, BUNCOMBE FARM, 1908 AND 1909. 
Plat 
No. 
TREATMENT 
Yield per Acre 
Average 
Increase 
Value of 
Increase 
Cost of Fertil¬ 
izer • 
Profit 
Grain, Bushels 
Stover, Pounds 
1908 
1909 
Avr. 
1908 
1909 
Avr. 
Grain 
Stover 
1 
2 
3 
4 
5 
NP..... 
NK__._.. 
PK_... 
None..__ 
NPK_ 
30.3 
18.6 
34.8 
33.2 
41.2 
20.0 
13.9 
16.7 
16.8 
17.6 
25.2 
16.3 
25.8 
25.0 
29.4 
4470 
3390 
2903 
2850 
3608 
1335 
1058 
930 
1133 
1110 
2903 
2224 
1917 
1992 
2359 
.2 
—8.7 
.8 
911 
232 
—75 
$ 3.78 
—5.16 
.26 
$ 3.13 
2.31 
1.28 
$ .65 
—7.47 
— 1.02 
4.4 
367 
4.55 
3.36 
1.19 
13 
18 
19 
17 
None_ 
Lime_ 
Lime, NPK.. 
Manure, P_ 
30.1 
35.6 
46.0 
47.4 
18.0 
16.2 
21.0 
23.7 
1 
24.1 
25.9 
33.5 
35.6 
2685 
2993 
3315 
3420 
1140 
983 
1230 
1073 
1913 
1988 
2273 
2247 
1.8 
9.4 
11.5 
75 
360 
334 
1.56 
8.02 
9.39 
.63 
4.62 
2.59 
.93 
3.40 
6.80 
Gain for N.. 
Gain for P. 
Gain for K.__. 
Average gain for Lime_ 
6.4 
22.6 
10.9 
5.2 
.9 
3.7 
—2.4 
.8 
3.7 
13.1 
4.2 
3.0 
705 
218 
—862 
8 
180 
52 
—225 
—19 
442 
135 
—544 
—6 
4.36 
9.71 
.76 
2.08 
2.08 
1.05 
.23 
1.26 
2.28 
8.66 
.53 
.82 
TABLE 8.—MINERALOGICAL AND CHEMICAL CO 
Labora¬ 
tory 
Number 
Depth 
to 
Which 
Sample 
Was 
Taken 
Pounds of Total Plant Food 
Constituents per Acre 
Surface, 6 2-3 inches....2,000,000 lbs. 
Subsoil, 28 inches_8,000,000 lbs. 
Minerals Other 
than Quartz in 
Abundant Minerals 
N 
P 2 0 6 
K 2 O 
CaO 
Sand 
Silt 
Sand 
Soil 
1201 
Inches 
0- 8 
1,458 
1,726 
14,385 
2,513 
Percent. 
25 
Percent. 
27 
Muscovite, biotite, 
Soil 
1202 
Inches 
10-36 
1,420 
776 
64,000 
11,360 
28 
33 
Biotite, muscovite 
