54 On the Rain and Drainage - Watcis at Rothamsted. 
Table LII. — Estimated Loss of Nitrogen, as Nitrates, in tlie 
collected Drainage-Waters from the different Plots in the 
Experimental Wheat Field, 
Thtkty Yeabs, Quantities in Lbs. per Acre. 
I LOTS. 
19 years, 
1851-2, 
to 
1869-70. 
7 years, 
1870-1, 
to 
1876-7. 
I year, 
1877-8. 
3 years, 
1878-9. 
to 
1880-1. 
1851-2,' 
to 
1880-1. 
2 years, 
1879- 8o', 
to 
1880- 1. 
+ or - 
30 yeaTB, 
1351-2, 
to 
1880-1. 
Plot 5. 
2 years, 
1879-80, 
to 
1880-1. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
3&4 
9-1 
Ill 
11-8 
15-9 
10-3 
15-2 
- 1-7 
- 1-5 
5 
JQ-6 
13-2 
AO U 
1 7 • ^ 
1 i o 
12 ' 0 
ID / 
6 
17-3 
22-7 ■ 
20-9 
20-7 
19-0 
22-4 
+ '7-0 
-1- 'h i 
7 
28-9 
38-9 
31-6 
25-8 
310 
28-3 
+ 19-0 
+ IIG 
8 
39-9 
53-2 
40-5 
34-3 
42-5 
42-5 
-i- 30-5 
+ 25-8 
9 
32-5 
35-6 
60-3 
48-0 
35-7 
58-3 
+ 23-7 
+ 41-6 
10 
40-4 
49-4 
48-2 
44-8 
43-2 
49-9 
+ 31-2 
+ 33-2 
11 
38-1 
49-6 
38-5 
35-2 
40-5 
39-5 
-1- 28-5 
+ 22-8 
12 
34-3 
45-7 
34-2 
30-1 
36-5 
34-6 
+ 24-5 
+ 17-9 
13 
35-4 
48-2 
35-9 
27-7 
37-6 
32-2 
4- 25-6 
+ 15-5 
14 
36-9 
49-4 
42-0 
32-1 
39-5 
36-5 
-1- 27-5 
+ 19-8 
15 
34-3 
*23-3 
58-9 
63-5 
35-5 
74-0 
+ 23-5 
+ 57-3 
16 
11.9 
14-7 
14-8 
lG-6 
13-1 
16-4 
+ 1-1 
- 0-3 
* Five years siiring-sowu. 
W ith regard to these estimates for different series of years, 
we will only call attention to the fact that they differ from one 
another in the direction that it would be expected they would 
do, having regard to the difference in the characters of the 
seasons, to the average character of the crops accordingly, and 
to the time of year at which the ammonium-salts were sown. 
The next Table (LIII.) shows for the whole thirty years : in 
the upper division, the estimated amounts of nitrogen removed 
in the crops and lost in the collected drainage, also the amount 
of that supplied which is unaccounted for in either crop or 
drainage ; in the middle division, the excess of the amounts on 
the plots with nitrogenous manure over those on Plot 5 without 
it, and the amounts of that supplied in manure which are not 
accounted for in the increase in crop and drainage together. 
Finally, there is given the percentage on the amounts supplied 
in manure, recovered in the increase in crop, in the increase in 
drainage, and unaccounted for in either. 
The first four columns show the results for Plot 5 with the 
mineral manure alone, Plot G with the mineral manure and 
200 lbs. ammonium-salts, Plot 7 with the mineral manure and 
400 lbs., and Plot 8 with the mineral manure and 600 lbs. 
ammonium-salts. It is seen that the nitrogen in the crop 
