334 Report of Experiments on the Growth of Barley, 
Table XLV. — Composition of Drainage-water from Plots diiferently Manured ; 
Broadbalk Field, Eothamsted ; Wheat every Year, commencing 1844. 
Nitrogen as Nitrates and Nitrites, per 100,000 parts of Water. 
Dr. VoiiLCKEirs Ecsnlts. 
MANURES PER ACRE, PER ANNUM. 
14 Tons 
Without 
Sulphate of Potass, Soda, and Magnesia and 
Superphosphate of Lime. 
(Dates of Collection^ &Ct 
Fiirniyiircl 
Manure 
every 
Year. 
Manure 
every 
Year. 
Nitrogen 
in Manure 
since 
1851. 
Nitrogen 
as 
Amnionia- 
salts. 
.£1.1 JLi lua. 
Nitrogen 
as 
Ammonia- 
salts. 
Atii-1 1 01 lha 
Nitrogen 
as 
Ammonia- 
salts. 
A IIU OZ lOS, 
Nitrogen 
as 
Nitrate 
Soda. 
Plot 2. 
Plots 3-4. 
Plot 5. 
Plot 6. 
Plot 7. 
Plot 8. 
Plot 9. 
Dec. 6, 1866, full flow .. 
1-956 
0-6i8 
0-878 
1-330 
2-170 
2-567 
0-707 
May 21, 1867, full flow .. 
0-052 
0-059 
0-089 
0-078 
0-274 
0-785 
Jan. ra, 1868, full flow .. 
1-256 
0-667 
0-926 
1-704 
2-811 
3-104 
1-196 
Apr. 21,1868, full flow .. 
0 085 
0-137 
0-189 
0-448 
0-578 
5-830 
Dec. 29, 1868, enormous flow 
0-500 
0-530 
0-952 
1-493 
1-874 
0-659 
Means . . 
1-606 
0-390 
0-506 
0-853 
1-400 
1-679 
1-835 
The conditions under which the results given in the above 
(and the next) Table have been obtained, should be further 
described as follows : — With the exception of Plot 9, as explained 
below, each plot has been manured as stated in the Table every 
year, commencing 1852. Further, Plot 2 received 14 tons of 
farmyard manure every year, commencing 1843-4. The un- 
manured portion consists of two lands, Plots 3 and 4 respectively, 
the drain running under the furrow which separates them ; Plot 
S has been unmanured since the commencement of the experi- 
ments in 1843-4, and for some years previously ; whilst Plot 4 
has only been unmanured since 1851 ; for which, and six pre- 
ceding seasons, it received ammonia-salts and superphosphate of 
lime ; the effects of the unexhausted residue from which are 
slightly apparent even up to the present time. Each of the other 
plots consists of two lands, the drain running under the sepa- 
rating furrow. For the crop of 1851, and several preceding 
seasons, Plot 5 received, besides mineral manure, ammonia-salts 
in rather heavy dressings, and also some rape-cake. The other 
plots also received various amounts of nitrogenous and mineral 
manure in 1851, and previously. Only one of the two lands 
comprising Plot 9 has received the mineral manure stated (com- 
mencing 1855) ; the other has had the nitrate alone : the quantity 
