178 INVESTIGATIONS ON ROTHAMSTED SOILS. 
of Manitoba soil very rich in nitrogen. The results are given in the 
following table : 
Table 92. — Percentages of soluble organic matter and soluble nitrogen in surface 
soils. 
Plat. 
Date 
of 
sam- 
ple. 
In partially dried soil. 
Nitro- 
gen 
per 
cent in 
soluble 
organ- 
ic mat- 
ter. 
In dry soil. 
Ni- 
tro- 
gen 
per 
cent 
of 
total 
nitro 
gen. 
Soluble in dilute am- 
monia. 
Soluble 
in di- 
lute 
soda, 
nitro- 
gen. 
Soluble 
organ- 
ic mat- 
ter. 
Soluble 
nitro- 
gen. 
Total 
nitro- 
gen. 
Dry 
matter. 
Organ- 
ic mat- 
ter. 
Min- 
eral 
matter. 
Manitoba (Selkirk) . . . 
5.900 5.385 
0.515 
0.309 
3. 88 
5.932 
0.3303 
.2433 
0.618 
.5876 
.4374 
.4298 
.4152 
.4102 
.3785 
.3773 
.3847 
.2604 
.2298 
.2359 
. 2057 
.2405 
.1574 
.1882 
.2170 
.1090 
.1009 
.0966 
.0992 
.1178 
. 1153 
. 1036 
. 1125 
.1152 
. 1125 
.1227 
.1329 
.3048 
.2449 
.1283 
37.2b 
41.24 
Rothamsted garden 
soil (clover) 
1857 
1 (S3) 
1879 
1879 
1879 
1879 
1896 
4. 705 
3. 800 
.905 
},5 
1 
I 
.3185 
.3202 
.2075 
.1686 
.1785 
.1748 
.1727 
.1494 
.1469 
.1374 
.1523 
.083 
50. 83 
53.03 
50.85 
44.54 
47.32 
45.44 
66.32 
65. 01 
62.27 
66. 80 
66.33 
52. 73 
2 
3 
1 
3 
1896 
1896 
1886 
1886 
1886 
1879 
1888 
1893 
1865 
1893 
1865 
1881 
1893 

3 
Rothamsted park: 
3 
6.373 
5.979 
5. 801 
6.242 
6.642 
6. 49 
2.710 
2.499 
3.536 
2. 201 
2.293 
1.282 
.96 
1.793 
.89 
.82 
.82 
.91 
.871 
.835 
.913 
.833 
.751 
.793 
.764 
1.040 
1.19 
1.90 
.85 
7 
7 (chalk and lime ) . 
Sir J. Henry Gilbert's 
meadow 
Do 
Broadbalk field 
(wheat): 
2a 
1.507 
1.410 
3. 147 
1.180 
1. 135 
1.007 
1.300 
.970 
.985 
1.080 
1.060 
.950 
.9130 
.930 
1.253 
1.300 
2.340 
1.320 
1.247 
.940 
1.740 
.870 
.900 
.800 
.887 
.850 
.815 
.887 
.800 
.730 
.770 
.740 
1.013 
1. 145 
1.840 
.840 
.260 
.470 
.407 
.310 
.235 
.207 
.413 
.120 
.170 
.193 
.260 
.220 
.160 
.190 
'.240 
.155 
.500 
. 480 
.081 
2b 
2b 
.111 
6.38 
.114 
52. 53 
3 
3 
3 
.049 
.057 
.062 
.060 
.051 
.052 
.062 
.058 
.060 
.073 
6. 13 
6.43 
7.28 
7.33 
5. 75 
6.55 
8.48 
7.50 
8.08 
7. 21 
.050 
.058 
.064 
.062 
.052 
.053 
.064 
.060 
.062 
.075 

— 
51.76 
58. 47 
54. 33 
53. 77 
50. 19 
47.11 
55. 56 
53. 33 
50. 53 
56.43 
5 
1893 
1893 
1893 
1893 
1X93 
1893 
1893 
1893 
1893 
1889 
1889 
1889 
8 
9a 
10a 
11 
12 
13 
14 
19 
Hoos field (barley): 
7 1 
7 -i 
O 1 
The data on which Professor Hilgard lays especial stress are those 
comprised under tin? heading " nitrogen per cent insoluble organic 
matter," which for the moment we may call the "Hilgard ratio." In 
the rich Manitoba soil this percentage is 3.88 only, or less than in 
any of the Rothamsted soils. The actual quantity of soluble nitrogen 
is high, the low ratio being caused by the very large proportion of 
humus extracted from this soil. 
Tlx* Rothamsted soils examined include garden soil, the park land, 
Sir Henry Gilbert's meadow, and the permanent wheat and barley 
fields. The "Hilgard ratio" is (in round numbers) 5.5 for the rich 
garden soil, from 5.8 to 6.3 in the park soil, from 6.2 to 6.6 in the 
meadow soil, and Prom 5.75 to 8.48 in the wheal soils. The least fer- 
tile of the wheat soils, namely, plat unmanured for fifty years, 
