EXPERIMENTS ON THE MIXED HERBAGE OE PERMANENT MEADOW. 321 
Table IX.—Average, per acre per annum, by 400 lbs. Ammonia-Salts, with Mixed- 
Mineral Manure containing Potass ; Plot 9. 
Average per acre per annum. 
Plot 5. 
Ammonia- 
salts alone. 
Plot 7. 
Mineral 
manure 
alone. 
Plot 9. 
Ammonia- 
salts and 
mineral 
manure. 
Plot 9. 
+ or — 
plot 5. 
Plot 9. 
+ or — 
plot 7. 
Hay. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
First period, 10 years, 1856-1865. . . . 
3420 
3797 
6002 
+ 2582 
+ 2205 
Second period, 10 years, 1866-1875 . . . 
2471 
4118 
5421 
+ 2950 
+ 1303 
Total period, 20 years, 1856-1875. . . . 
2946 
3958 
5711 
+ 2765 
+ 1753 
Second period, per cent. + or — first period 
-27-7 
+ 8-5 
-9-7 
Nitrogen. 
First period, 10 years, 1856-1865 .... 
579 
55-2 
75 7 
+ 17-8 
+ 205 
Second period, 10 years, 1866-1875 . . . 
47-3 
580 
70-7 
+ 234 
+ 127 
Total period, 20 years, 1856-1875 . . . . 
526 
56-6 
73-2 
+ 20-6 
+ 16-6 
Second period, per cent. + or — first period 
—18 3 
+ 5-1 
-6-6 
Mineral Matter (Ash). 
First period, 10 years, 1856-1865 .... 
181-2 
246-2 
368-3 
+ 187-1 
+ 122-1 
Second period, 10 years, 1866-1875 . . . 
108-9 
2616 
3010 
+ 192-1 
+ 39-4 
Total period, 20 years, 1856-1875 .... 
145-1 
254-0 
334-6 
+ 189-5 
+ 80-6 
Second period, per cent. + or — first period 
-399 
+ 6 3 
-18 3 
By this combination of ammonia-salts and mixed mineral manure supplying all the 
mineral constituents of the crop, except silica, we have, over 20 years, considerably more 
than twice as much hay as without manure, nearly twice as much as by the same 
amount of ammonia-salts used alone, and nearly one-and-a-half time as much as by the 
same mineral manure used alone. There was, however, a falling off in the produce of 
the last 10 years compared with the first 10, of nearly 10 per cent., or in nearly as 
great a proportion as without manure, but in very much less proportion than with the 
ammonia-salts without the mineral manure; whilst, on the other hand, there was an 
increase instead of a reduction in the later years with the mineral manure alone. 
The average annual yield of nitrogen per acre was more than twice as much as 
without manure, more than one-and-one-tliird time as much as by the same amount 
of ammonia-salts alone, and nearly one-and-one-third time as much as by the same 
mineral manures used alone. There was a falling off in the yield over the second 
10 years compared with the first 10, but in less proportion than in that of the hay, in 
less proportion than without manure, and in much less than where the ammonia-salts 
MDCCCLXXX. 2 T 
