EXPERIMENTS OX THE MIXED HERBAGE OF PERMANENT MEADOW. 333 
the results on plot 9, with the mineral manures and the nitrogen applied as ammonia- 
salts, and those on plot 14, with the same mineral manures and the same quantity of 
nitrogen applied as nitrate of soda. As, however, the experiments with the nitrate 
were not commenced until two years later than those with the ammonia-salts, the 
periods selected for illustration will be 8, 10, and 18, instead of 10, 10, and 20 years. 
Table XII.—Average, per acre per annum, by 550 lbs. Nitrate of Soda, and Mixed 
Mineral Manure, including Potass; Plot 14. 
r 
Average per acre per annum. 
Plot 9. 
Mineral manure 
Plot 14. 
Mineral manure 
Plot 14 
and 
ammonia-salts. 
and 
nitrate soda. 
+ or — 
plot 9. 
Hat. 
lbs. 
lbs. 
lbs. 
First period, 8 years, 1858-1865 . 
5904 
5944 
+ 40 
Second period, 10 years, 1866-1875. 
5421 
6777 
+ 1356 
Total period, 18 years, 1858-1875 . 
5636 
6407 
+ 771 
Second period, per cent. + or — first period . . 
- 8-2 
+ 14-0 
Nitrogen. 
First period, 8 years, 1858-1865 . 
75-4 
67-6 
- 7-8 
Second period, 10 years, 1866—1875 . 
707 
70-6 
- o-i 
Total period, 18 years, 1858-1875 . 
72-8 
69-3 
- 3-5 
Second period, per cent. + or — first period . 
- 6-2 
+ 4-4 
Mineral Matter (Ash). 
First period, 8 years, 1858-1865 . 
356T 
357 - 2 
+ IT 
Second period, 10 years, 1866—1875 . 
3010 
373-2 
+ 72-2 
Total period, 18 years, 1858-1875 . 
325-5 
366-1 
+ 40-6 
Second period, per cent. + or — first period . . . 
-15-5 
+ 4'4 
When 550 lbs. of nitrate of soda were used alone there was considerably more yield 
of hay, of nitrogen, and of mineral matter, than when 400 lbs. of ammonia-salts were 
employed, and there was also a much less reduction of yield over the later compared 
with the earlier years. Here, again, when each of the nitrogenous manures is used in 
conjunction with the mixed mineral manure, we have a much greater produce of hay 
when the nitrogen is applied as nitrate of soda than when as ammonia-salts. There is 
also more mineral matter taken up under the influence of the nitrate, but rather less 
nitrogen. And, whereas with the ammonia-salts there is a decline in annual yield of 
hay, and in the quantity of nitrogen and mineral matter taken up, over the second 
