118 
Drought of 1870 and 
hay and wheat. That is to say, higher amounts of both corn 
and total produce have been obtained from the use of a given 
amount of nitrogen applied as nitrate of soda, than from that of 
an equal amount applied as ammonia-salts — both manures being 
in the case of barley sown in the spring. 
In 1868 experiments were commenced in which nitrate of 
soda was used in conjunction with mineral manures, and below 
are given the results obtained in 1868, 1869, and 1870, with 
mixed mineral manure and 200 lbs. of ammonia-salts per acre 
per annum, compared with those of the same mixed mineral 
manure and 275 lbs. of nitrate of soda, which is estimated to 
contain about the same quantity of nitrogen as the ammonia- 
salts. As in the case of wheat, not the actual number of bushels 
measured, but the bushels of dressed corn calculated at an 
assumed uniform weight per bushel are given. For barley, 52 lbs. 
per bushel is taken. 
Table VII. — Showing the effects on the Barley Crop of a given amount of 
Nitrogen as Ammonia-salts, comiiarcd with an equal amount as Nitrate 
of Soda. 
Dressed Cobx. 
(In bushels of 52 lbs.) 
Straw. 
Total Prodcce. 
(Corn and Straw.) 
Mineral 
Manure and 
Ammonia- 
salts. 
Mineral 
Manure and 
Nitrate .Soda. 
Mineral 
JIanure and 
Ammonia- 
salts. 
Mineral 
IManure and 
Nitrate Soda. 
Mineral 
Manure and 
Ammonia- 
salts. 
Mineral 
Manure and 
Nitrate Soda. 
Bushels. 
Bushels. 
lbs. 
lbs. 
lbs. 
lbs. 
1868 .. 
37 
49 
2333 
2868 
4311 
5454 
1869 .. 
.54'' 
38.53 
4265 
6701 
7194 
1870 .. 
41f 
48| 
2090 
2050 
4287 
4621 
Mean 
44;' 
50^ 
2759 
3061 
5100 
5756 
Here, then, we have again a similar result. There is, too, 
proportionately a greater increase with the nitrate, especially 
of corn, in the two drier and hotter seasons of 1868 and 1870 
— years, in fact, of summer drought. 
The following Table shows the produce of barley without manure, 
with farmyard manure, and with mixed mineral manure and 
200 lbs. ammonia-salts per acre, in 1SC8, and in 1870, the two 
recent years of summer drought; and also, under the same condi- 
tions as to manure, the average produce over the nineteen years of 
the experiment. As before, the number of bushels of dressed corn, 
reckoned at an uniform weight of 52 lbs. per bushel, is given. 
And, side by side with these records of produce, is given the 
