EXPERIMENTS ON THE MIXED HERBAGE OF PERMANENT MEADOW. 399 
Table XXXI.—Produce of Hay per acre on selected plots. Average of the 20 years; 
produce of 1868, the year second in order of productiveness; produce of 1874, the 
year second in order of unproductiveness ; difference of each from the average ; and 
difference of the one from the other. 
Plot 7. 
Plot 9. 
Plot 11. 
Plot 14. 
Plot 3. 
Mixed 
Mixed mineral 
Mixed mineral 
Mixed mineral 
TJnmanured, 
mineral 
manure, and 
manure, and 
manure, and 
Means. 
continuously. 
manure, 
400 lbs. 
800 lbs.* 
550 lbs. 
alone. 
ammonia salts. 
ammonia-salts. 
nitrate soda. 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. » 
Average 20 years, 1856-1875 . 
2383 
3958 
5711 
6726 
6407f 
5037 
1868 . 
1960 
4264 
6622 
7616 
7728 
5638 
1874 . 
1412 
3088 
3290 
3540 
5484 
3363 
f 1868 . 
- 423 
+ 306 
+ 911 
+ 890 
-1321 
-r 601 
+ or - average \ 1874 . 
- 971 
- 870 
-2421 
-3186 
- 923 
-1674 
1874-1868 . 
- 548 
-1176 
-3332 
-4076 
-2244 
-2275 
* 400 lbs. only in 1859, 1860, and 1861. 
f Average of 18 years only, 1858-1875. 
