58 
INVESTIGATIONS ON KOTHAMSTED SOILS. 
Table 29. — Average weight of fine dry soil and of stones per acre in different 
experimental fields at Rothamsted and at different depths; also average per- 
centages of nitrogen in the fine dry soils at the respective depths. 
[Summary for each field— Broadbalk, Hoos, -Agdell, and Barn fields.] 
AVERAGE WEIGHTS OF FINE DRY SOIL PER ACRE. 
Depth. 
Broadbalk 
field— sam- 
ples col- 
lected 1865, 
1881, 1887, 
and 1893. 
Hoos field- 
samples col- 
lected 1881, 
1882. 1883, 
and 1885 
(from legu- 
minous 
land ) : 1881, 
1883, and 
1885 (from 
wheat 
fallow); 
1868 and 
1882 (from 
barley- 
land). 
Agdell 
field— sam- 
ples col- 
lected 1867, 
1874, and 
1883-81. 
Barn field- 
samples col- 
lected April, 
1870 (from 
root land. 
First 9 inches 
Second 9 inches . . 
Third 9 inches 
Fourth 9 inches . . 
Fifth 9 inches 
Sixth 9 inches . . . 
Seventh 9 inches . 
Eighth 9 inches . . . 
Ninth 9 inches 
Tenth 9 inches 
Eleventh 9 inches 
Twelfth 9 inches . 
Pounds. 
2,558,912 
2,592,259 
2,814,991 
2,886,-339 
2,917,681 
2,955,543 
2,814,612 
2,888,789 
2,938.868 
2, 868. 118 
2.SO4.970 
2,795, 772 
Pounds. 
2,593,290 
2,720,656 
2,890,627 
3.047.939 
3.074,563 
3.012.298 
3,016, 107 
2.952,629 
2. 924, 185 
2,865,290 
2.760,455 
2,817,918 
Pounds. 
2,347,580 
2,448,399 
2,532,703 
2,441,895 
2,465,262 
2,587,276 
2,517,401 
2. 654, 461 
2,589,332 
2,478,854 
2,610,067 
2,644,314 
Pounds. 
2,321,160 
2,673,095 
2,650,950 
AVERAGE WEIGHTS OF TOTAL STONES PER ACRE. 
First 9 inches 
Second 9 inches.. 
Third 9 inches 
Fourth 9 inches . . 
Fifth 9 inches 
Sixth 9 inches 
Seventh 9 inches . 
Eighth 9 inches ... 
Ninth 9 inches 
Tenth 9 inches 
Eleventh 9 inches 
Twelfth 9 inches . 
497, 
443, 
212. 
163, 
202, 
144, 
282. 
210, 
162. 
183, 
K57, 
176, 
480, 640 
346, 120 
238,244 
170,440 
164,834 
190,302 
114,259 
141.802 
179.368 
209.074 
248. 766 
804,905 
837.352 
480, 133 
363.038 
476. 574 
52:5.083 
289. 4 i7 
472, 762 
404, 655 
402. 734 
528. S91 
397.021 
274, 700 
AVERAGE PERCENTAGES OF NITROGEN IN FINE DRY SOIL. 
First 9 inches 
Second 9 inches. . 
Third 9 inches ... 
Fourth 9 inches . 
Fifth 9 inches 
Sixtli 9 inches 
Seventli 9 inches 
Eighth 9 inches. . 
Ninth 9 inches. .. 
Tenth 9 inches 
Eleventh 9 inches 
Twelfth 9 inches. 
Per ret. 
0.1145 
.0724 
. 0598 
.0488 
.0428 
.0393 
.0368 
.0368 
.0350 
.0858 
.0376 
.0286 
Per cent. 
0.1098 
. 0870 
.0571 
.0469 
.0440 
.0463 
.0439 
. 042IJ 
.0401 
.0886 
.0431 
. 0415 
Per cent. 
0. 1273 
. 0727 
. 0028 
.0513 
.0405 
.0447 
.0437 
.(1114 
.0138 
(1111 
.0417 
.0402 
Pe 
cent. 
0. 0973 
.065 1 
. 0577 
A study of these tables (28 and 20) will show, in the first place, that 
in the case of the soils of the first '.» inches, or surface depth, the 
mean pereentages of nitrogen in I lie soils of each of t lie fields varies 
