160 INVESTIGATIONS ON KOTHAMSTED SOILS. 
Table 85. — Hoos field falloiv ivheat and leguminous land, etc. — Continued. 
NITROGEN AS NITRATES, PER ACRE. 
Depth. 
Samples 
collected 
March, 1881. 
Samples col- 
lected July 26-31, 
1882, 
Samples collected July 
17-26, 1883. 
Samples collected July 
29- Aug. 14, 1885. 
Wheat- fallow 
land. 
Leguminous 
land (series 
1, plats 2-6). 
Trifolium re- 
pens (series 
1, plat 6). 
Melilotus 
leucantha. 
Wheat-fallow 
land. 
Trifolium re- 
pens (series 
1, plat 4). 
Vicia 
sativa. 
Wheat-fallow 
land. 
Trifolium re- 
pens (series 
1, plat 5). 
Melilotus leu- 
cantha (se- 
ries 1, plat 5). 
Medicago sa- 
tiva (series 
1, plat 5). 
f-> ^ 
co 
0> ft 
CO 
T c3 
f" 1 r-i 
co ^ 
co ;o 
CP +3 
CO " 
First 9 inches 
Second 9 inches . . . 
Third 9 inches 
i otai nrsc 
To tnirci v 
inches 
Fourth 9 inches . . . 
r ii til v iiiciies- . 
Sixth 9 inches 
Total first 
to sixth 9 
inches 
Seventh 9 inches 
Lbs. 
/ . Uo 
3.35 
3. 13 
Lbs. 
11. 95 
8.29 
18. 36 
Lbs. 
o. o» 
2.97 
1.91 
Lbs. 
3. 92 
1.81 
.90 
Lbs. 
3.39 
.97 
.61 
Lbs. 
19.48 
8.05 
2.47 
Lbs. 
30.33 
27.73 
8.44 
Lbs. 
11.94 
4. 11 
1.37 
Lbs. 
10.03 
2. 72 
1.08 
Lbs. 
17.12 
3.67 
2.76 
Lbs. 
11.29 
1.38 
.90 
Lbs. 
4.27 
1.40 
2.12 
Lbs. 
8.72 
1.11 
.78 
lo. OO 
oo. oU 
1Q A 1 ? 
lo. 4( 
6.63 
4.97 
30. 00 
66. 50 
17.42 
13.83 
23.55 
13.57 
7.79 
10. 61 





3.09 
4. 38 
5. 16 
.78 
1.11 
2. 10 
.99 
.84 
1. 65 
2.70 
1.62 
3.57 
7.64 
9. 07 
8.77 
1.67 
4.58 
6. 37 
1.52 
2. 51 
4.42 
2. 16 
1.68 
1.47 
1.86 
7.08 
11.31 
2. 94 
5.22 
6.21 
.81 
.99 
.93 
26. 10 
10. 62 
8.45 
37.89 
91.98 
30.04 
22.28 
28.86 
33.82 
22. 16 
13.34 
3.84 
2.28 
1.48 
1.70 
2. 94 
1.84 
"7T92 
8.34 
8.27 
9.95 
9. 16 
9.51 
7.16 
5.95 
4.54 
5 32 
4.52 
4.92 
4.81 
5. 14 
1.77 
1.83 
2.29 
2.01 
1.98 
2.06 
13. 14 
12.63 
11.19 
10.70 
11.08 
9.96 
7.95 
10.08 
9.66 
9. 16 
8.83 
10. 12 
.57 
.81 
.70 
.61 
.44 
.41 
3.54 
Ninth 9 inches 
Eleventh 9 inches . 
Twelfth 9 inches 
5. 66 6. 40 
5. 32 6. 46 
Total seventh 
to tweittn 
9 inches 
14.14 
53.15 
33.95 
32.25 
11.94 
68.70 
55.80 
Total first 
to twelfth 
9 inches 
52. 03 
145. 13 
63.99 
54.53 
40. 80 
102. 52 
77.96 
16.88 
First 9 inches 

17.12' 11.29 
3.67 1.38 
4.27 
1.40 
73. 21 
8.72 
1.11 
6. 97 
Second 9 inches 
Mixture third to 
twelfth 9 inches . 
Total 
20.63 
88.02 
41.42 
100. 69 
78.88 
16.80 
Exigencies of space will not allow of a thorough discussion of the 
results in all their detail, but the principal deductions from them can 
be made clear by examination of some selected plats. Primarily the 
most, interesting are the wheat-fallow plats and the Trifolium repens 
(white clover) plats, sampled in 188-') and L885. If we take the total 
twelve depths (0 feet) of soil and subsoil, we find that the wheat-fallow 
plats contained in the form of nitrates, in round numbers, 52 pounds 
and 41 pounds per acre, while Die white-clover plats, the same depi h, 
aboul L45 pounds and 102 pounds. On the average the clover plats 
showed noi far short of three limes as much nitric nitrogen as the 
wheat-fallow land. 
Clearly this enormous difference is to be correlated with the much 
larger quantity of organic nitrogen Pound in the clover soil, owing to 
accumulated root residue, there being not only more nitrogen to 
become nitrified, but the excess of organic matter being more favor- 
able (as it is within certain Limits and in presence of lime) to the 
activity of the nitrifying process. 
