304 Report of Erperiments on the Growth of Barley, 
marked that, although the figures would be different, the general 
result would be the same, whether produce or increase were 
compared. It would not be so in the case of the experiments 
now under consideration. Hence, the Table has been arranged 
to show the comparison, both between the produce per acre, and 
the increase of produce by the mineral manure and 400 lbs. 
of ammonia -salts, over that by the corresponding mineral 
manure alone. 
Table XXXVII. — Average Annual Produce and Increase of Wheat and of Barley 
by Mixed Mineral Manure, and 400 lbs. Ammonia-salts per Acre per Annum. 
Manitres per Acre, pee Aknttm : — 
3i Cwts. .Superphosphate of Lime. 
3(10 lbs. (1) Sulphate of Potass. 
200 lbs. (-) Sulphate of Soda. 
100 lbs. Sulphate of Magnesia. 
400 lbs. Ammonia-salts. 
Average Annual 
Produce per Acre. 
Mineral 
Mantrre 
Barley over 
(or under — ) Wheat. 
Mineral 
Manure and 
400 lbs. 
Ammonia- 
^salts. 
Mineral 
Manure 
alone. 
and 
Ammonia- 
salts over 
Mineral 
alone. 
Produce. 
Increase. 
Total Corn, per Acre. 
Wheat (Plot 7), 20 years, 1852-1871 .. 
Wheat (Plot 7), 6 years, 1852-1857 .. 
Barley (Plot 4 AA), 6 years, 1852-1857 
lbs. 
2228 
2195 
2801 
lbs. 
1068 
1171 
1914 
lbs. 
1160 
1024 
887 
lbs. 
606 
lbs. 
-137 
Straw (and Chaff), per Acre. 
Wheat (Plot 7), 20 years, 1852-1871 .. 
Wheat (Plot 7), 6 years, 1852-1857 .. 
Barley (Plot 4 AA), 6 years, 1852-1857 
3959 
4233 
4073 
1678 
2012 
2012 
2281 
2221 
2061 
-160 
-160 
Total Produce (Corn, Straw, and Chaff), per Acre. 
Wheat (Plot 7), 20 years, 1852-1871 .. 
Wheat (Plot 7), 6 years, 1852-1857 .. 
Barley (Plot 4 AA), 6 years, 1852-1857 
6187 
6428 
6874 
2746 
31S3 
3926 
3441 
3245 
2948 
446 
-297 
(') Only 200 lbs. after the first 7 years of wheat, and 6 of barley. 
Only 100 lbs. after the first 7 years of wheat, and 6 of barley. 
Before directing attention to the results themselves, it should 
be premised that, as in the last experiments quoted, the wheat 
plot had grown 8 crops, liberally dressed with artificial manures, 
prior to the period to which the figures refer ; but the results with 
barley commence with the first year of the experiments, and the 
application of 400 lbs. of ammonia-salts to that crop was only 
continued for the 6 years referred to. To the wheat, however, the 
application has been continued up to the present time ; and, over 
2U years, it has yielded an average of more corn, though less 
