18 On the Eaiii and Drainage • Waters at Rotliamsted. 
Table XLIII. — Chlorine and Niteogen as Nitkic Acid in Drainage- 
Waters from Beoadbalk Field collected near the beginning and 
end of a running, in June 1879, in parts per Million. 
PloU. 
Slanuring. 
June 2. 
June 3. 
Ohlorin6> 
Nitrogen 
Nitrates. 
Nitrogen 
Nitrates. 
O&'k 
0-8 
none 
2-3 
0-9 
e 
0 
Mixed Mineral iMannre .. 
0-6 
none 
31 
lo 
6 
200 lbs. Amm. Salts and Mms. 
12-6 
0-9 
23-6 
40 
7 
400 lbs. „ „ „ 
22-3 
30 
43 0 
6-5 
8 
600 lbs 
38-9 
9-3 
58-4 
13-8 
9 
550 lbs. Nit. Sodium and Mins. 
2-2 
120 
7-6 
31-7 
10 
400 lbs. Ammonium-Salts 
34-S 
16-2 
61-4 
25-7 
11 
Ditto, w ith Superphosphate 
37-1 
10-7 
66-9 
18-6 
12 
Ditto, ditto, with Sulph. Sodium 
35-8 
7-8 
59-8 
13-3 
13 
Ditto, ditto, with Sulph. Potass. 
33-9 
4-3 
631 
7-9 
14 
Ditto, ditto, with Sulph. Mag. . . 
34-6 
7-3 
43-3 
10-5 
16 
400 lbs. Amm. Salts and Mins. 
4-5 
3-2 
12-1 
7-9 
17 
Mixed Mineral Manure .. 
2-5 
none 
7-3 
1-5 
18 
400 lbs. Ammouium-Salts 
29-7 
3-9 
56-7 
7-7 
discharging, while drainage will continue for some time at a 
diminishing rate from lower and lower layers of soil, it is plain 
that the waters will under these circumstances become weaker 
as the drain ceases to run. 
The waters from several of the plots have been collected at 
frequent intervals while the drains were running, with the espe- 
cial object of ascertaining if any alteration in the composition 
of the waters occurred. A selection of some of the more charac- 
teristic results recorded for Plots 12 and 13 during a single 
season will be found in Table XLIV. Numerous other hourly 
collections have been made, showing similar results. 
The ammonium-salts were applied to Plots 1-2 and 13 on 
March 12, 1879. The first running of the drains occurred on 
April 7 ; the pipes had been running for at least an hour when 
the first collection was made ; the size of the stream was then 
about two-tenths of the pipe. No rain fell during the collec- 
tions ; the waters were all clear. The result of the hourly 
examination made shows that both chlorides and nitrates had 
diminished to less than one-half of their first amount by the 
time the drains had ceased to run, eight hours after the first 
collection. 
The next running took place on April 13. The pipes ran 
for at least an hour before the first collection at 2 P.M. The 
size of the stream at this time was about four-tenths of the pipe. 
The waters were clear. It will be noticed that the chlorides in 
the first collection at this date are much larger than they were at 
