70 
Journal of Agricultural Research 
Vol. VIII, No. 3 
Total CaO: 
mined 
Deter- 
Not dissolved by 4 
per cent HC 1 : by 
difference 
Difficultly decom¬ 
posable calcium 
silicates 
Dissolved by 4 per 
cent HC 1 : Deter¬ 
mined 
Not dissolved by 2 
per cent HC 1 : by 
difference 
Easily decompos¬ 
able calcium sili¬ 
cates 
Calcium carbonate 
calculated from 
C0 2 found 
Calcium sulphate 
calculated from 
S0 3 found in water 
solution 
Calcium combined 
with humus by 
t difference 
Dissolved by 2 per 
cent HC 1 : Deter- < 
. mined 
The figures obtained in this way are presented in Table IV. 
Table IV .—Calcium compounds in soils stated as calcium oxid 
CLASS I 
Soil. 
Holland sandy loam: 
Soil, 0-18 in. 
Subsoil, 18-40 in. 
Gloucester fine sandy loam: 
Soil, 0-10 in. 
Subsoil, 10-36 in. 
Sassafras loam: 
Soil, 0-9 in. 
Subsoil, 9-36 in. 
Collington loam: 
Soil, 0-8 in. 
Subsoil, 8-21 in. 
Dower subsoil, 21-36 in 
Total 
CaO. 
CaO as 
CaCOs. 
CaO as 
CaSO*. 
CaO as 
easily 
decom¬ 
posable 
silicate. 
CaO as 
diffi¬ 
cultly 
decom¬ 
posable 
silicate. 
CaO 
with 
humus. 
3- iS 
0.05 
0. 06 
3. 01 
0. 06 
2. 98 
. II 
Trace... 
.09 
2.77 
. 02 
2. 70 
. 20 
0. 01 
. 10 
2. 39 
2. 77 
.04 
. 08 
2. 65 
• 70 
•23 
. 01 
.04 
.42 
.48 
. II 
Trace. .. 
. 02 
•34 
. 01 
I. OO 
. 14 
Trace. .. 
*°5 
.66 
•15 
• 55 
. 08 
. 02 
.07 
•38 
•63 
• 05 
. 01 
. 04 
• 53 
CLASS 11 
Spencer silt loam: 
Soil, 0-8 in. ... 
Subsurface, 8-24 in_ 
Subsoil, 24-36 in. 
Lower subsoil, 36-72 in 
Helmer silt loam: 
Soil, 0-12 in. 
Subsoil, 12-30 in. 
Lower subsoil, 30-36 in 
Helmer loam: 
Soil, 0-6 in. 
Subsoil, 6-20 in. 
I. 26 
0. 20 
Trace... 
0. 04 
1. 01 
0. 01 
I. 11 
. 08 
...do_ 
.04 
.99 
1. 29 
•05 
...do_ 
•03 
i- 15 ' 
. 06 
.96 
.08 
...do_ 
•32 
•23 
•33 
1. 41 
.08 
. 02 
. 04 
1. 27 
i- 34 
• 13 
. 01 
•05 
15 
1. 26 
, 12 
Trace... 
.04 
1.10 
•57 
•05 
Trace... 
•03 
• 49 
1. 12 
. 02 
...do_ 
. 02 
1. 08 
