142 
INVESTIGATIONS ON ROTHAMSTED SOILS. 
Samples were drawn for analysis in March, 1868, and in March, 1882, 
to three successive depths of 9 inches, or 27 inches in all. 
TOTAL NITROGEN. 
The following table (Table 77) shows the total nitrogen found in 
all the samples that were examined in 1868, and in all of the soils and 
most of the subsoils sampled in 1882. The results are shown both as 
percentages and as pounds per acre, and it should here be stated that 
the weights of soil per acre taken for all computations of acreage 
weights in the Hoos field barley plats were as follows: 
Table 77.— Hoos field continuous barley plats — Adopted weights of fine dry soil 
per acre. 
First 9 
inches. 
Second 9 
inches. 
Third 9 
inches. 
Pounds 
2,527,879 
2.361,461 
2.486,870 
2.084,567 
Pounds. 
|2,593,a53 
Pounds. 
2,661,134 
Used tor plat 7 (2) 
Notice should be taken of the fact thai the nitrogen results are all 
those of determinations by the soda-lime method and not by the 
modern Kjeldahl method. (See discussion of the results of the two 
processes in connection with the wheat-soil results). 
Table 78. — Hoos field continuous barley plats — Total nitrogen (by soda-lime 
method), stated as jiercentages of fine dry soil and as pounds per acre, in sam- 
ples collected March, 1868, and February-March, 1882. 
AA. 
A AS 
First 9 inches. 
Second 9 inches. 
Third 9 inches. 
Collected 
March, 1868. 
F^bruar; 1 Collected 
MafchT^. March. 1868. 
F C ebriwv Collected 
MalXi882. March. 1868. 
Collected 
February- 
March, 1882. 
Pe- 
cent. 
Pounds 
per 
acre. 
Per 
cent. 
Pounds 
per 
acre. 
Per 
cent. 
Pounds 
per 
acre. 
p Pounds 
Per 
cent. 
Pounds 
per 
acre. 
Per 
cent. 
Lbs. 
per 
acre. 
0.(1930 
.0887 
2,351 
2.20S 
2. 452 
2.S41 
0. 0652 
. 8538 
1,691 
1.395 
0. 0490 
1,304 
1,088 
.0409 
0. 1202 
3,038 
.1124 
0.0752 
1,951 
.0837 
2,171 
0. 0708 
1,884 
.0730 
1,943 
1. 172 
1.722 
.0900 
. LO20 
. 1040 
.1096 
.0660 
.0649 
1,712 
1,683 
7055T 
.0647 
2. 578 
2. 020 
2.771 
.1124 
2,841 
.IN 12 
2,080 
.0772 
2,002 
.0763 
2,030 
.0020 
1,650 
.1080 
. 1078 
.1112 
. Hi:,; 
2.730 
:.'.;•.'.-> 
2,811 
2. 072 
. 0759 
1,969 
. 0838 
1,700 
. 1211 
3,069 
.0700 
1,971 
.0683 
1,772 
.0628 
1.671 
.0530 
1,426 
.1042 
.1136 
.1188 
. 102;) 
2,034 
2. 868 
2.W4 
2,580 
.0793 
.0636 
2.(157 
1,650 
. 0646 
1,719 
.0885 
1,777 
1. 129 
1 . 682 
1 M5 
.1234 
.1207 
. 1380 
. 1300 
2.914 
2.K50 
8,141 
'■\. OH I 
.0633 
.0684 
(r.i:t 
1,642 
1,774 
1 Ron 
.0537 
.00:52 
.0643 
..0739" 
1.917 
. 1300 
3,220 
.0733 1,901 
.052:) 
1.392 
.0631 1 678 
. 17! is 
.2131 
4.471 
1. 142 
.0811 
.08:16 
2. 1(14 
168 
.0605 
(1523 
,.C10 
1 . ;«)2 
