8 
On the Rain and Drainage • Waters at Rothamsted. 
Table XXXVII. — MAifrBrKG and Produce of Bboadbalk Wheat- 
Field, per Acre, per A>-srM. 
Plot. 
Mastjees. 
30 Years, 
1852-1881. 
Dressed 
Com. 
Total 
Produce 
I (Cora 
I and 
1 Straw). 
15 rears, 
1867-1881. 
Dressed 
Com. 
Tout 
Produce 
(Com 
and 
Straw). 
2 
3&4 
5 
6 
7 
8 
9a 
96 
10 
11 
12 
18 
U 
15 
16 
17 
18 
19 
Bushels. 
14 tons Farmvard-Manure i 33§ 
Unmanured I ISJ 
Mixed Mineral Manure ' 15i 
200 lbs. Ammonium-salts and Mixed ilinerab 24 
400 lbs. „ „ .. ; 32^ 
600 lbs. „ „ .. I 36 
550 lbs. Nitrate of Sodium and „ . . . . 36| 
550 lbs. Nitrate of Sodium, alone ! 23i 
400 lbs. Ammouium-salts, alone j 21Z 
„ „ „ and Superphosphate \ 26 
„ „ „ and Sulph. Sodium 31 
„ „ „ and Sulph. Potassium 31 J 
„ » )i and Sulph. JIag. 31| 
„ „ „ and Mixed Minerals ' I 311 
Unmanured^ 25i 
Mixed Mineral Manure ' * 15i 
400 Ammonium-salts ' I * 29| 
1700 lbs. of Eape-cake ' I 28| 
lbs. 
4696 
2169 
2443 
4006 
5769 
6737 
6903 
4293 
3687 
4402 
5301 
5561 
5424 
5396 
4678 
2574 
5171 
4758 
Bushels. 
' 31J 
■ Hi 
i2i 
20i 
;: 28i 
'1 33i 
i 36i 
20t 
18 
221 
,1 26J 
11 27i 
I 2^ 
«3i 
t »27 
II 25} 
lbs. 
5304 
1726 
1984 
3348 
5013 
6219 
6920 
3587 
2904 
3716 
4493 
4964 
4716 
4826 
2131 
2090 
4619 
4025 
• For 1872 and previously, 400 lbs. sulphate of ammonium were applied on half 
the plot, and on the other half 300 lbs. sulphate of ammonium and 500 lbs. of rape- 
cake, both halves receiving mixed mineral manure. Up to 1872 the superphosphate 
for this plot was prepared with hydrochloric acid. 
' From 1852 to 1864 this plot received 800 lbs. ammonium-salts, with the mixed 
mineral manure. 
^ The manures on these two plots alternate each year. 
' Average of mineral manure, alternating with ammonium-salts. 
' Average of ammonium-salts, alternating with mineral manure. 
' For 1878 and previously, 300 lbs. sulphate of ammonium, 500 lbs. rai)e-cakc, 
with superphosphate, the latter made with hydrochloric acid. 
acre.* The same quantity of superphosphate (3J cwts.) is applied 
in all cases ; but an increased amount of the sulphates of sodium 
and magnesium is applied to Plots 12 and 14, the quantities of 
the two sulphates being respectively 366^ and 280 lbs. 
The " ammonium-salts" are in every case a mixture of equal 
parts of the sulphate and muriate of commerce. The 400 lbs. 
of ammonium-salts, the 550 lbs. of nitrate of sodium, and the 
1700 lbs. of rape-cake are believed to contain approximately the 
same quantity of nitrogen ; the rape-cake is somewhat variable 
in composition. 
In Table XXXVIII. will be found an estimate of the quan- 
tity of each substance annually applied in manure, expressed 
• In 1858, and previously, 300 lbs. of sulphate of potassium, and 200 lbs. of 
sulphate of sodium were cuiploytd. 
