Experiments with different Toj)- Dressings upon Wheat. 23 
Tabmo I. — Showing the Produce, in lbs. and bushels* of Coi'n on Exjjeri- 
■manf.al Plots, calculated per Acre, and the Increase per Acre over 
Unman ured Plot. {Weiglit per bushel, lbs.) 
Plot. 
Manure employed per Acre. 
Produce in Corn 
per Acre. 
Increase of Corn 
per Acre. 
I. 
II. 
III. 
IV. 
V. 
VI. 
VII. 
VIII. 
4 cwt. of wheat-manure 
2 J cwt. of Peruvian guano 
1^ cwt. of nitrate of soda .,■ 
Ilj cwt. of nitrate of soda and'l 
2 cwt. of sulphate of ammonia .. 
11)3. 
2480 
2720 
2U0G 
2804 
2080 
2004 
259G 
24G0 
bushels. 
42 
47J 
35i 
34 
44 
41§ 
lbs. 
476 
716 
602 
800 
76 
.. 
592 
456 
bushels. 
8 
lOi 
13i 
l.i 
10 
n 
* In calculiiting the produce in bushels, the odd pounds have been omitted for convenience' sake. 
Table If. — Showing the Produce in Sfi^aic per Acre, and Increase over 
Unmanured Plot. 
^hmure per Acre. 
4 cwt. of wheat-manure 
H cwt. of nitrate of soda 
(3 cwt. of salt and cwt. of nitrate"! 
\ of soda / 
3 cwt. of salt 
Unmanured 
2 cwt. of sulphate of ammonia . . 
32 bushels of soot 
Produce in Straw 
per Acre. 
Increase in Straw 
per Acre. 
tons cu t. qrs. lbs. cwt. qrs. lbs. 
1 
13 
1 
20 
6 
1 
0 
1 
16 
0 
12 
8 
0 
20 
1 
17 
3 
16 
10 
2 
24 
1 
19 
3 
24 
12 
3 
4 
loss 
I 
3 
3 
16 
3 
1 
4 
1 
7 
0 
20 
1 
18 
0 
8 
10 
3 
IG 
1 
13 
3 
24 
6 
3 
4 
3. The special wheat-manure, which has a similar composition 
to that used in 1859, did not give as favourable a result as nitrate 
of soda and salt, nitrate of soda alone, sulphate of ammonia and 
guano. This result seems to prove that whilst on good land 
purely ammoniacal or nitrogenized manures may be most econo- 
mically employed as top-dressings for wheat, on naturally poor 
soils mixed mineral and nitrogenized manures are the most 
desirable. 
On such soils, especially when deficient in available phosphates, 
a manure, containing phosphatic constituents as well as nitrates 
and ammoniacal salts, applied at the rate of 4 or 5 cwt. per acre, 
is likely to produce a heavier crop, and leave the land in a better 
condition, than nitrate of soda and salt. 
4. Nitrate of soda alone gave not nearly so good a result as 
the same quantity of nitrate mixed with twice its weight of salt. 
This agrees perfectly with my experience of 1859 ; it should 
