Section III. 
THE BROADBALK WHEAT SOILS (Continued). 
COMPARISON OF RESULTS OF ANALYSES OF THE VARIOUS SAM- 
PLES DRAWN, RESPECTIVELY, IN 1865, 1881, AND 1893. 
TOTAL NITROGEN AND ORGANIC CARBON. 
We have complete sets of nitrogen determinations in the samples 
of 188] .-^ well as in those of 1893, and also nitrogen determinations 
in the less complete set taken in lsr,;>. 
It will be remembered (see earlier discussion, p. 25) that, in dis- 
missing the L893 Bample&, we have adopted, as probably the more 
BOrrect, the results Of the nitrogen determinations made by the K.jcl- 
dahl method; but, for comparison with the earlier results, we must 
take f or the L893 samples the determinations made by the soda-lime 
method, as these alone will be st rict ly comparable with the figures 
similarly obtained lor the lsr,;, and 1881 samples. The deficiencies 
should be fairly constant at all three periods, and should not mate- 
rially affect the differential results. 
We also have organic carbon determinations in t wo out of the three 
sets of samples. 
Tables G7 and US set forth both the nitrogen and carbon results, 
Stated in terms of percentage and as pounds per acre based upon the 
adopted weights of soil already explained. 
Table 6?.— BroadbaXk wheat soUe— Total nitrogen {by soda-lime method), stated 
as percentages of fine dry toil and as pounds per acre, in samples collected 
October, 1866, I kstobt r, tssi, <md Octoh r, 16 
FIRST 9 INCHES, 
1865. 
1881. 1893. 
Per cent. 
Pounds 
per acre. 
Per cent. 
Pounds 
per acre. 
Per cent. 
Pounds 
per acre. 
Plat 2a 
0.1520 
.2132 
.0906 
.0971 
. 1076 
.1146 
.1167 
.1116 
.1058 
.1002 
.1029 
.1119 
.mo 
.1088 
.1204 
.1188 
.1110 
.1117 
.1204 
.1309 
3,815 
4,976 
2.437 
2,349 
8,517 
2. 790 
2. 971 
3.026 
2. m 
8, 743 
2,598 
2. 668 
2.901 
2,878 
2,821 
3, 122 
3,080 
2,878 
2.896 
3,122 
3,377 
Plat 2b 
(1.1752 
. 11 (.-)() 
4.343 
2. 722 
0. 1836 
.1009 
.(1919 
.(I9S1 
.11(10 
. 12ii7 
.126(1 
. 12(H) 
. 1064 
.1034 
.1(137 
.1121 
.1155 
.1191 
.1163 
.1178 
.1066 
.1088 
.1116 
.1230 
4.399 
2.616 
8,883 
2. 54'3 
2. 867 
3.129 
3,867 
3.111 
2, 759 
2.681 
2,689 
2,906 
2.994 
3.088 
3,015 
3,054 
2, 764 
2,821 
2,893 
3.186 
Plat I 
Plat 6 
PlatT 
.1170 
3,034 
Plat 8 
Plat Ua 
Plat 9b 
.1178 
3,054 
Plat H »a 
Plat 10b 
.1065 
2. 7ftl 
Plat 11 
. 1 125 
.1157 
.1151 
.1154 
2.91»i 
2.999 
2.984 
2.991 
Plat 12 
Plat 14 
Plat 18 
.1210 
3, 137 
Plat 17 
Plat 10 
125 
