170 
INVESTIGATIONS ON ROTHAMSTED SOILS. 
It will be seen that each table gives the results in two forms. On 
the left-hand side of the tables the analytical results are so arranged 
as to afford for each set of rotations (un manured, superphosphate, 
and mixed manure) an easy comparison between the nitrogen found 
in the plats from which the turnips, both roots and tops, have been 
annually removed or carted, and that found in the plats on which the 
roots have been consumed by sheep or, in some cases, chopped up and 
returned to the land. The right-hand side of the tables rearranges 
the same results in such a way as to allow us easily to compare in 
each series of rotation those portions of the plats on which leguminous 
crops (beans or clover) have been grown in the intervals between 
the barley and wheat, and the corresponding portions which have been 
allowed to remain fallow during this stage of the rotation. 
Table 89. — Agdell field experimental rotation land — Soil samples collected in 
1867 (after ivheat), 1874 (after clover), and 1883-84 (after tcheat)— Percentages 
of nitrogen in fine, dry soil of first 9 inches. 
UNMATURED. 
Plat. 
Samples collected in— 
Mean. 
Nov.. 1867 
(after 
wheat). 
Oct., 1874 
(after 
clover). 
Nov., 1883. 
to Jan., 
1884 (after 
wheat). 
Fallow: 
Roots fed 
21-22 
17-18 
Per cent. 
0. 1303 
. 1233 
Per cent. 
0. 1297 
.1165 
Per cent. 
0. 1230 
.1135 
Per cent. 
0. 1277 
.1178 
.1268 
.1230 
.1183 
.1228 
Beans or clover: 
Roots carted 
Roots fed 
23-24 
19-20 
.1303 
. 1297 
.1378 
.1187 
.1308 
.1205 
. 1310 
.1210 
. 1300 
. 1283 
.1257 
.1280 
.1284 
.1257 
.1220 
.1254 
Carted: 
Fallow 
Beans or clover 
21-22 
23-24 
.1303 
.1303 
.1297 
. 1378 
.1230 
.1308 
.1277 
.1330 
. 1303 
. 1338 
.1269 
. 1303 
Fed: 
Fallow 
Beans or clover 
17-18 
19 20 
.1233 
.1297 
.1165 
.1187 
.1135 
.1205 
.1178 
.1230 
.1265 
.1176 
.1170 
. 1204 
.1284 
.1257 
71820" 
. 1254 
SUPERPHOSPHATE. 
Fallow: 
Roots carted 
13-14 
9-10 
0. 1224 
.121(1 
0.1147 
.1126 
0.1161 
.1228 
0.1177 
1198 
. 1232 
. 1137 
. 1195 
.1188 
Beans or clover: 
Roots carted 
Roots fed 
Mean 
15-16 
11-12 
. tm 
. L880 
.1241 
, 1321 
. 1207 
. 1298 
. 1258 
. 1322 
. 1354 
. 12*1 
. 1252 
1295 
. 1293 
.1209 
. 1223 
.1242 
